Thank you for taking the time to make this demonstration. I just ordered an fx-991ex as a replacement for my 30+ year old fx-991n. The LCD display in the 991n finally gave out. The 991ex has many, many more functions to offer than the 991n, most of which I'll probably never use. However, it is nice to have tools on hand just in case a need does arise or just to play around with once in a while. I also have an fx-160 that I got in Singapore circa 1980. It is still going strong!
Glad you found it helpful. I hope you enjoy your new fx-991EX. The build-quality of Japanese products (including cars) in the 1980s was amazing. Thanks for leaving a comment, Lee.
Thank you so much. I have the fx-115ES PLUS and sometimes I have to wait for some seconds for the SOLVE. I've been looking for this SOLVE duration comparison which I could not find from anywhere else than here. Thanks a lot. I am ordering 991 right today.
The spreadsheet mode is such a life saver for me. Its saves me minutes of time spent on doing tabulated calculations. It's my favourite mode to use in an exam
We can make that even a little more complicated: I got the fx-991DE X, DE stands for deutsch/german. This version has the repeating decimal display, GCD/LCM, product function and a few other things. Kind of a combination of the two. I really like the SwissMicros DM42, I grew up with RPN and that‘s how my mind works. Greetings from Switzerland!
The calculator world is strange -- much more regionalized than I would have expected. The fx-991DE X sounds like a great calculator -- my biggest gripe is the display font, as I think they could/should have made it clearer and less stylized. As for RPN, I am definitely a fan -- an HP28S was my constant companion through engineering school. But, for most of the work I do these days (high school math tutoring/teaching), the Casio is a better fit. Thanks for the comment, Mr. K!
I would love to have the DM42 but the price is completely unreasonable. I will not pay more than 200USD they ask for a simple calculator similar to the ones Casio sells for 20 american bucks. It should be at least less than 100 to even consider ordering one.
@@Kirillissimus you have to cnsider the fact that the dm42 is a programmable calculator and also the fact that swiss micros is a small company also since rpn calculators are not hat common today they dont have as many customers as casio for example so for it to be worth it to them the calculators have to be a but pricey ubfortunetly tho you could get the dm 15 a great calculator not as hig tech as the dm42 but still great it is also not that expensive and the reason kt costs over 200 for you is cuz of delivery i live two coutries frkm switzerland so if i got one it would cost me delivery included around 175 euros or around 195 dollars
The Iberia version (Spain and Portugal) of the 991ex has all of those functions from the 115 es too (remainder division, gcd, lcm, intg and reccuring decimal input) it's pretty weird how Casio changes some of their calculators based on region. I think the Japan version also has a periodic table app
I really like the unit conversion menu on the fx-991ex. Freshman year of college I had a Casio with the unit conversion reference numbers listed on the calculator cover but decided to commit the reference numbers to memory since I worried that referencing the calculators cover during tests may raise suspicions that I was cheating with hidden notes on the calculator's cover following another student getting caught doing exactly that.
Great Comparison. The different features in different regions has a lot to do with the local education systems. Calculators are allowed in tests, but only if they have or don't have certain features. A good example of this is the TI 30x PLUS and TI 30x PRO in germany... In a few german states, they don't allow some of the features that the pro has, so you have two, nearly identical calculators, except one is missing a few features from the other, to satisfy local education authority rules regarding what is allowed during tests.
Very valuable review, thanks! There is one glaring flaw in both of these calculators, IMO. Older and simpler calculators have a dedicated button for switching from decimal to scientific notation, something I constantly want to do. Instead, now we have the academically useful, but not very practical, SD button to switch from fractions to number representation quickly. In chemistry, when evaluating significant digits, sometimes you need to align decimal points to determine the sig figs and then need decimal; sometimes you just look at leading digits and want scientific. Also, comparing calculation results to published numbers is tedious if you can't match the notations. Casio should have figured out a quick way to toggle back and forth. I would rather bury the "ENG" notation button (I never use it) in favor of a "FloSci" floating-point-to-scientific button. Even adding this feature to the SD choices in a rotating manner might be satisfactory. Any way to implement it with no more than two button presses is needed. Another feature sorely needed that I cannot find so far is a way to store the solutions to the built-in equation solver for polynomials (Mode | EQN(5)) so that you can continue to calculate with the solution you obtain. Solving a quadratic in X does not store a root anywhere. It would make sense when viewing the solution to be able to exit to Mode 1 after viewing a root of interest and have the result in the X or M or even the ANS variable. Having all the roots saved of course would be even better, but not sure how to do it without more variables. Otherwise, the fx-115ES PLUS 2nd Edition is a very useful calculator aside from the display lacking enough contrast.
Glad you found it useful, Simon. Thank you for leaving a well-thought out comment. I think the "FloSci" is probably not a highly-typical use case, however, it might be really cool if you could simply set the "SD" key (called something different) to be more configurable -- that way it could do what you are describing and/or the way it works now. You could also set how many different things it cycled through. The ability to save roots of a quadratic is something that the TI-36X Pro and the TI-30X Pro MathPrint (not sold in the USA) both offer. I agree that the display on these calculators in general is not ideal. The SwissMicros DM42 is amazing in this regard, but costs about 10 times as much, so it should have a great display.
With all the different versions of the same scientific calc you would think Casio would implement the most basic feature of power-off memory protection to save your calculation history in Comp mode like TI does. Casio could rule the U.S. market.
It would be great if we could combine the features of the TI-36X Pro and the Casio fx-991EX. But, for some reason they each do it their own way. I think if Casio added power-off memory protection hardly anyone would know the difference (aside from calculator nerds like me).
Baffling. These companies (Casio and Texas Instruments, particularly) and all their marketing games are confusing. Sorry to hear those are missing from the 991ES -- thank you for letting others know. It is the first time I have ever heard of an actual difference between the 115ES and the 991ES -- I incorrectly assumed they were just different names for the same device based on historical/marketing reasons.
Sometimes the professional certification agencies don't allow some calculators. Example: NCEES known as the National Council of Examiners for Engineering and Surveying. But, what is very strange is that both of these Casio calculators are allowed in these tests.
Too bad we cannot get an answer from CASIO's mouth. There is some reason they offer both and with the particular functions they do. I think somehow related to standardized testing is a likely hypothesis.
Thank you for the detailed review. I was pondering between getting the es plus vs ex to replace my fx-991w due to the darkened lcd display and one of the main functions I use is the log 10 and thank you for pointing out the location of this key is there (same as my old cal) and that it doesn't rock on the table. I would have probably gotten an EX otherwise and regretted getting it. I'll order an ES plus and save myself money and headache. Thank you so much once again.
The complex number solutions of the equation can be displayed on the CASIO fx-991EX display as a separate real part and imaginary part. To do this, select Fraction Result ➞ 1: a b/c in the settings. Then the real part is shown in the answer as a separate mixed fraction and the imaginary part as a separate fraction with the sign of the square root in the numerator. 🥰🥰🥰
Thanks for the comparison. Now that the 991ex is no longer available I am wondering if the 115ES Plus 2nd Ed would make a good backup? Yes there is the Ti 30X Pro MathPrint and it does have nice features such as the persistent memory but I like the Casio layout since I have using them for years.
YES. I think the fx-115ES Plus 2nd Edition would make a good backup. I actually prefer it over the 991EX, but I doubt most people would. The other thought would see about buying a 991EX used off ebay.
Thankyou so much for this, i used a 991EX and i gave it to my sis and bought a115ES plus and i felt bad about buying the wrong one(i wanted the 991EX) but now i feel way better with my calculator! Thanks again!
Nice comparison. I just received the fx-991EX and while it is great and I like the display and speed, my biggest complaint is the case color and use of the faux carbon fiber finish. I'm shade-blind and find it very hard to read the key labels (red and blue). Luckily it only cost me $15, or I would have returned it. It will still find some use as long as I don't need to mess with those extra functions. I'm now considering getting the fx-115ES as my main calculator, as it looks to be much easier to read the key labels with its light colored case.
I have noticed that I cannot get all of the features I want in any one calculator. item A is better on this Calculator, item B is better on that calculator, and item C is only on that one Canon. the Casio Super Fx Plus Fx-5800p has formulas but misses other things, I have a Canon that has a better implementation of the constants (symbol and name), etc. etc.
So true. Cars are the same way, but they are much more complex. It surprises me that after all these years calculators are as different as they are. I recently concluded that you need to view as different types of wrenches -- they all do the same basic job, but excel in different situations.
the fx-5800P is programmable, and cannot be used by students in most exams in Asia. It is not meant for students, as it has less "direct" function keys. However, the programming capability boosts its power and you can do many things like finding complex exponentials, cube roots, powers etc. It can multiply two 10x10 matrices, and hence solve linear equations in 10 variables!
Hi Scott, although the video is old, I hope you can see my commend and give me some advice. I'm looking for a replacement of my fx-991s (Bought around 1995 and it was still working ok, but it was stolen from me). That calculator had the particularity that it was really slim. Are these series 991ex, 991es plus 2nd edition, slim? The 991s was, I would say, slim as a current smart phone or even a bit less!
I just measured both calculators and they are right around 13-14 mm from table surface to top of buttons. Definitely thicker than my iPhone SE. I would not say that either calculator is slim, but they are both a bit thinner than the TI-36X Pro and Sharp EL-W516X. Hope this helps, Francisco.
I have never run into a calculator that would do that, but I don't think it would be too difficult to program (for someone who actually knows what they are doing -- i.e. not me).
Excellent review. Thanks a lot. I've almost bought the 991 EX due to my ignorance 🙂 The fx-115ES is better because the EX lacks in certain features: Sigma summation is present but the product (pi notation) is gone, hyperbolic functions are gone, modulo operation is gone. Some operations require more key strokes. *For most people the EX is ideal and should be the choice* but those (very few, e.g. mathematicians) who want more serious functionality and less key strokes should opt for the fx-115ES. I mean the EX is a perfect calculator because the operations removed from the EX are not needed for an average student. If you need hyperbolic functions, capital pi, then the fx-115ES is the way to go. For me removal of the above is a huge dumbing down!
None that I am aware of -- in fact, this seems to be something people dislike about a generally well-liked calculator. The TI-36X Pro and TI-30X Pro MathPrint maintain calculation history even after being powered off. Here's a video I made about the latter -- th-cam.com/video/KcN9guPLwRQ/w-d-xo.html
In the US it is still sold (www.casio.com/us/calculators/scientific-fraction/), but in other markets it might not be. I do think, though, that in many markets it is called the fx-991ES (www.casio.com/intl/scientific-calculators/product.FX-991ESPLUS-2/).
It seems like the 991 was almost built for the professional engineering exam. The extra memory allows for complicated solving with much less lag time than is offered on other approved models (the fx-115 and ti-36x). I began my studying with all three, I used the fx-115 through college and the FE, for me the fx-991 was the obvious choice.
The processor in the 991EX is on a completely different performance tier. I just wish they offered a setting to emulate the larger, more-readable font of the 115ES. But, I don’t claim to have the best eyesight. Good for you for pursuing a PE, btw. Oh, one other comment - I wish all three calculators were more adept with vectors; they are clunky compared with HP48GX; even the HP42S is more adept.
@@metatechnologist Is it the 991ES or 991EX? I'm guessing it is the 991ES which in other markets, as I understand it, is the same as the 115ES in the USA.
@@scottcollins7513 It appears not to be. It's listed on Amazon as fx991 ES plus 2 and above the display there's a " second edition". It's like a 991 but has black keys now.
@@metatechnologistThat sounds like it is just the black version of the same calculator (115ES) I have in the white version in this video. Thanks for the info and for taking the time to leave a comment.
Had to make this choice today, I ultimately went for the newer FX-991CW with the simplified layout because I thought it looked aesthetically pleasing. The cover clips on instead of sliding, which becomes very loose over time as each slide wears down the bumps that hold the cover in place. Time will tell if I will get tired of digging through menus for more complex stuff 🙃 Definitely weird pricing, both were $20. Even without considering design, the faster, sharper calc just seems like a better deal.
Thanks for leaving a comment. I think I will likely pick up a fx-991CW and make videos about it. I agree that the CW is likely the better value for most people, even if personally I like the fx-115ES PLUS 2nd edition.
For mathematics I prefer Casio. For engineering I prefer TI. But it is close. Between the 115ES and 991EX, I personally like the large font of the 115ES and the extra functions, but the 991EX has better build quality, much faster chip, and dedicated x key. Personally, I prefer the 115ES. But I think most people would like the 991EX. You can't go wrong with any of the three.
@@scottcollins7513 Hi, maybe you know that, on the European market available the upgraded version of the 36X Pro, the TI-30X Pro Mathprint (education.ti.com/de/products/calculators/scientific-calculators/ti-30x-pro-mp ). This calculator is the most powerful non-graphic model on the market. It can handle functions like (in table mode): g(x)=d/dx(f(x),x). With this feature you can calculate in one table the function values and it's derivative. Of course, this is available on 36X Pro also, BUT you can use it also when you leave table mode eg. in this way: (g(x+a)-g(x-a))/(2a). With this feature you can calculate numerically second derivative values. I guess the memory can handle the numerical solution of the above and you can easily find the inflexion points. The g(x)= something function of f(x) is not available on any CASIOs, so I am sure the TI-30/36 line is the best if you do not want a graphing calculator or not allowed.
To the best of my knowledge none of this level of scientific calculators (from Casio, Texas Instruments, and Sharp) can do what you are looking for. The hp Prime and SwissMicros DM42 are able to, but they are at a much higher price point.
First, you probably should talk to people at the school(s) you plan/hope to attend to get a feel for what calculators are permitted / best for the particular school. Different colleges have different rules/philosophies. In the price range of the two CASIOs shown in the video, there is also the TI-36X Pro. I am not a TI fan, generally speaking, but out of the 3 calculators, the TI-36X Pro would be my choice for engineering b/c of how it allows you to easily reuse previous expressions and results in a very easy way. Not to complicate things, but the TI-30X Pro MathPrint is even better than the TI-36X Pro if you are either located in UK/Europe *OR* are willing to spend $40 for a calculator that is maybe 10-15% better than the TI-36X Pro.
I actually bought the casio fx-991 ex classwiz recently but it happened to have lines flickering and also the screen is not clearer even if i increase the contrass please can you tell me whats the problem.
Hi, Miss Dori. I do not know. My understanding is that the fx-991ES is very nearly the same as the fx-115ES, but these calculators are regional by nature, so it is next to impossible to keep track of the minor differences.
The fx-991ES PLUS C (2nd edition) has exactly the same functions as the fx-115ES PLUS (2nd edition). I personally like the fx-991ES PLUS C more for its color choice (black). Unfortunately, it cannot be bought officially in Europe. I have both of these calculators that are discussed in this video. Apart from them, also fx-991ES PLUS (2nd edition). However, the latter has fewer functions than the fx-991ES PLUS C.🥰🥰🥰
Thanks for this detailed comparison. There are a couple of points I can add, in the last generation's favour as it happens: - if you use X as your variable in solve mode you don't need to specify it after a comma (at least on my fx-991ES and I imagine it must be the same on the fx-115) - while the thousands separator on the new generation is nice, it's less important if you're doing something like engineering. Then you can specify Sci display mode and automatically get results in scientific notation meaning there are no thousands to separate. I do wish there was an automatic engineering notation feature so that you wouldn't have to press ENG all the time which would be even better. I don't know if the new generation has this?
- You are correct about not needing to specify "x" after a comma when it is the variable you are solving for on the fx-115 ES Plus (1st and 2nd Ed). - The 2nd Ed does NOT have a dedicated ENG mode. Both the SHARP EL-W516X and the TI-36X Pro *DO* have this feature Thanks for leaving the comments, Ernst.
@@scottcollins7513 Interestingly, I just bought the German version of the fx-991EX, the fx-991DE X. It has (as far as I can tell) all the missing features from the fx-115ES+. This makes sense, since essentially the same model as it used to be sold in Europe as the 991DE. Unfortunately the interface is only in German and cannot be changed to English. There also exists a Japanese variant apparently with even more features, the fx-JP900. It can be changed to English but has physical button text in Japanese. It's also rather expensive to buy in Europe as you can imagine. Thanks for the tips about ENG mode. Edit: I believe the 2nd gen *does* have an engineering mode, called "Engineer Symbol" in the English version. Even better, it displays (you can also enter) with SI prefixes, which is something I have previously only seen on Casio's graphical calculators.
@@ernstliebleid587 Good information. I did not even think about the fact that it would be in German language, but makes perfect sense that it would be. Also, interesting about the SI prefixes. I have seen that before, but forget which particular calculator. I may need to explore that further. Thanks for leaving helpful comments!
It is unfortunate that the same model has different features depending on the market/region. I think the 991EX is going to be the better choice for most people. It has a much faster processor and better screen. In your case it sounds like the 991EX would be the clear choice. Thanks for the info. By the way, what region of the world are you in? My videos are typically of the US models. Take care.
@@scottcollins7513 Ohh thanks for the response! I live in India. It's pretty annoying that they remove features based on the region, I don't even know why they do that. This video was very helpful to me. Take care!
@@abhinavg3348 Glad the video was helpful to you. Thanks for the reply regarding your region of the world -- so cool that on TH-cam we are all "neighbors". Take care.
I do not know. Casio seems to change functionality based on the region. If worth the hassle, you could download a manual for your region and compare functions.
Casio Classwiz fx-991EX is good and the others regional versions too, but the best is the vesion of Spain, it has more functions than American version and than others regional version in the world. I recommend check out it, greetings.
I've heard the German version also has additional functions. Had not heard about the Spanish version, but good to know. Thanks for letting me (and others) know.
Not sure -- I think you could probably find out from Casio's website if it really matters to you. They both are very full-featured for the price point.
Why Casio made an update taht is not un update? The 115es plus 2nd Ed. looks like the 991 (es?) German Edition. The normal edition (not plus) has no added functions similar to the one sold in Italy - no lcm, no recurring number, etc). Are the 115 the Us models of the 570/ 991?
All the different variations and model names based on different regions of the world makes it all confusing. My understanding is that the US 115ES is the same as Europe's 991ES.
@@scottcollins7513 yes. But we don t have the choice of boying, even if old, the 115 plus version with gcd and lcm, for example, and there are at least other 8 main missings plus others, someone listed them in the Amazon section. There is the german version 991 DEX which includes at least some(?) of the 115 es plus 2nd edition functions, reaching a total of 686 functions). I am feeling upset, honestly. Also, here everybody idolizes the 991 ex "international version" while Casio make fun of us.
@@scottcollins7513 if I can exploit your kindness, I have been looking at TI 30x pro mathprint (that should be "your" 36x) and I have seen that it has abs, lcm, gcd, Poisson and probably other stuff. It lacks the pre-ans function and the disequation solver (the few things I was able to quickly check) but it seems more complete than the fx 991... "standard". I have never used TI. Is the 991 ex better even with missing functions? I have been reading of hundreds of positive comments about Casio but nothing about the TI...
I absolutely love the 991 ex it feels like my best investment worth every penny. It's sad the upgraded version to this much loved boy didn't get as good response. Nonetheless I will get a 991 CW anyways I just don't want to miss on the update to spreadsheet mode which keeps the data intact even when changing mode unlike what it's like in the EX
I do not know much regarding calculators that are best for Python programming. I would recommend you check out www.reddit.com/r/calculators/ since I have seen discussion of this sort of topic on that subreddit. Thanks for asking -- sorry I was not more helpful.
There are no calculators that are made specifically for Python programming, but any calculator that has a BaseN mode will help you in conversions and basic logical operations. The fx-CG50 graphing calc has Python, but you won't be allowed to use it in exams.
Here in the US we have the Texas Intruments "Ti-84 Plus CE Python Edition". It can do Python programming. Is this what your looking for? I don't know much about math stuff. But I have seen this calculator before here.
The most preferable feature of the 991 Classwiz the Solver which can handle the d/dx() and integrate() functions. With this feature you can solve all kind optimization problems and all the separable differential equation solving problems, like this Clausius-Clapeyron integration: th-cam.com/video/RMSq6b7Obgg/w-d-xo.html I am a mechanical engineer and with my fx-991 I can solve easily integrate() + Solve problems, like Betti's theorem examples for beams.
Add in the different names and even different capabilities (e.g. supposedly the 991EX in Germany has more functions than the 991EX in the USA) for different world markets, and it gets really wacky.
@@scottcollins7513 In Germany they have the fx-991DE X, 87DE X in addition to the 991EX, and they have 82DE PLUS, 85DE PLUS, 87DE PLUS, 991DE PLUS. The 991DE X and 991DE PLUS have those 115ES PLUS functions.
@@Crazytesseract Amazing how many different versions of these calculators CASIO and others sell -- and how they differ from region to region. My current USA favorite is the fx-115ES PLUS 2nd Edition. The dream version would be your 991DE PLUS or 991DE X with the fast chip and the nice-looking high-resolution display, but with the option of the large font used on the fx-115ES PLUS 2nd Edition which I find ideal.
Of the two, I think most would choose the EX bc the small font would not bother their eyes and the much faster processor would come in handy now and then. That said, I would pick the TI-36X Pro (or comparable model if you are outside US) over either Casio bc of the way it allows easy reuse of previous results.
Why the German version 991 DE X has all functions as 115ES 2nd (GCD, LCM, periodic numbers, verify...)? Original 991EX or CE X has not these functions... it is strange.
I agree - it is strange. I think it must be because of standardized tests prohibiting certain functions. Happy that at least Germany gets a more full-featured version. Wish we did.
On the TI-86, for 3x^3 -ln(x) = 10, i get x=1.5141803007514 but L-R = 1.3 E-12. Then, i have graphics on that TI, and i see something interesting for this function, for example there is a bottom. How would you find it ? The min of that function.
3x^3-ln(x)=10 is not a function, but rather an equation. x=1.51418... is an approximate solution to this equation. What did you graph on your TI-86? I'm guessing you graphed y=3x^3-ln(x). To find the minimum would require using calculus to find where the slope of the tangent is zero, but that is something different than solving the original equation. Off the top of my head, I do not know how to solve the equation algebraically. I would resort to using an approximate solution (e.g. graphing or a calculator's solver).
I would think you could buy one from a US-based retailer -- if none of the big stores ship into Canada, maybe a college book store would work -- I bought my UK TI from a UK-based retailer. Are you sure that Casio does not offer the calculator you want locally? Seems like Canada would have a version.
Casio Canada lists the model on their website: www.casioca.com/products/calculators/fraction-and-scientific/fx-991ex I'm guessing you could reach out directly to Casio and ask for a list of retailers.
I do not know what to suggest. Are you confident that the calculator is a CASIO and not a knock-off / counterfeit? I'm assuming you are using it in a well-lit room. If you are confident it is a CASIO, you could contact them about potentially getting it replaced if it is still under warranty. Sorry you are having a problem w/ it.
I'll try to help you out, but I'm not clear on what you are asking. There is a constant for pi built-in -- it's a SHIFTed function of the middle key in the bottom row ("x10^x").
It is letting you know the difference between the left side (“L”) and right side (“R”) of the equation when solving via iterative solve. Typically, you should see “L-R=0”, meaning it found an “exact” solution.
Yes. As long as you stay in the same mode (if you switch to another mode, like imaginary, then you will lose your calculation history) and the calculator does not power off due to inactivity, you are able to look backwards through your previous calculations on both calculators. Exactly how much history each keeps I do not know.
HP use to make dedicated calculators. About the only one they make now is the HP-35s. It is great for engineers but not so much for students. Casio also offers the new fx-991ms 2nd edition which is similar to the 115 es plus but with S.V.P.A.M. instead of textbook display.
I have a Casio fx-115 MS (the original). It has a truly annoying bug that it recalculates the value when you store it to memory. This does havoc when you use Ans. If you calculate 5 = , Ans + 2 =, Sto A, then A will be 9, not 7 like in other calculators.You can avoid his by entering: Ans Sto A, but it is easy to forget this. The nice feature of MS series is that functions do not open parenthesis so you do not need to close them either.
I think Casio FX-JP900-N is just fx-991EX with those features from fx-115ES PLUS 2nd edition. You can change the display language from Japanese to English if you wish for the FX-JP900-N.
Hay, look. The are Casio FX-92+, FX-92, FX-92B with the same design and with GCD, LCD, ÷R functions, and even a programming by blocks mode in fx-92+ Maybe it is the reason why Casio restricted fx-991ex. But unfortunately they are only in French, except 92B
It is strange how many variations CASIO makes for their scientific calculators. And, on top of that, how they vary by region. I suppose part of it is due to the many different world languages. I think part is also due to all the different types of standardized tests taken and what calculator models are officially approved for the specific test. Crazy variety. Thanks for leaving a comment, Andrey.
First question is do they sell the TI-30X PRO MathPrint (must be MathPrint) where you live? If so, THAT is the one to get. If not (for ex if you live in the US), then I need to know what are you planning to use it for.
@@scottcollins7513 Your very welcome! Great video, It was nice to see the diffs between these two models. Though I am not sure why they left GCD and LCM off the US model of the 991.
@@dalhend My best guess as to why the US gets a "watered-down" 991EX is either related to standardized testing approval or as a marketing ploy to eek some more life out of the 115ES (991ES). Not sure. I have heard that the German "991EX" has all the features that the US version is missing. Strange. Thanks for the kind words.
At least in Germany there are various federal states with conflicting opinions what’s allowed in exams. Casio has several models according to these restrictions. After the exams, like in your job, you’d used the unrestricted one to make things easier for you.
I want to get the 115ES cause I used the 115EX all through my engineering undergrad and I'm very familiar with it. I want to use the get the 991EX cause it looks a lot more intuitive and I don't want to peek on the back of my calculator for unit conversions during standardized exams! But also the 991EX is so ugly 🤢 Decisions decisions
For engineering work, I think I would rather use the TI-36X Pro (than the 991EX or 115ES). Or, you could get really adventurous and consider the HP 35S.
@@daisydo7669 Happy to try and help. My main reason is not the saving of history (though that is a plus). My main reason is because of how much easier it is to reuse previous results without having to save them. I demonstrate this advantage at beginning of this video --> th-cam.com/video/beUZrvdnPG8/w-d-xo.html If you were happy w/ the Casio approach, you would certainly not be crazy to stay with the brand.
I’d love to understand the marketing gymnastics at work. And it’s not just Casio. TI is a US company yet they continue to sell an outdated version of the TI-36X Pro when Europe gets a new version (but sold as a TI-30X Pro Mathprint or something like that). Baffling.
@@scottcollins7513 Thanks for your reply. But it might allow you to switch to English, I'm not sure. The fx-JP900 (Japan specific), has the English option. If you could get it, you will have a "115 EX", plus atomic weights and many more unit conversions. (But I don't really need all that, so I am ok with the 991EX for now.) A Casio fx-JP910 might be on its way. Btw I am from India.
Now I am pretty sure that I have to buy Casio FX-991ES Plus-2nd generation because I will be appearing for NSEJS (an Indian exam) I must have some feature which are missing in both of these calculators in the video. We do not use calculators very often in India especially students under 12th grade but I must buy one..........
which has better display / contrast? Most TI calculators I worked with, you can't read when it is flat on table, you have to hold it in hand to read it, so that display is it at an angle. Thanks
Neither display is particularly good, Sartaj. I prefer the ES b/c the font is bigger and the fonts are clearer (e.g. the "6" is overly stylized on the EX, causing it to look too much like an "8" in my view). I would say the displays are on par w/ the TI displays. Your criticism is valid for every LCD calculator I have ever used -- some are better than others. The DM42 is the best, but it should be for the price.
The fx-991EX has a much faster processor. That’s what I would choose of the two in this video. That said, you should also consider the TI-36X Pro (slower processor than the 991EX, but I like the way you can easily reuse previous calculations). I have a video comparing the 991EX and the TI-36 that you might find helpful.
In fact I wrote to Casio telling them, for what they could care, they gave lost a 60 years- long client. And that make this market policies, considering we are the EU, is very childish.
@@MrMarcec85 Don't feel too bad. Here in the US, the home of Texas Instruments ("TI"), they do not offer the latest version of the TI-36X Pro -- we still get the old version. It's so strange all the marketing games played by the different manufacturers. I think part of it may be related to the standardized testing market -- not sure.
Using the quadratic formula to find the roots of a quadratic expression (ax^2+bx+c), you will get two imaginary roots any time that b^2-4ac (called the discriminant; it's the part of the expression under the square root symbol) is less than zero. If you graph a quadratic expression y=ax^2+bx+c and it fails to cross the x-axis of the graph, it means it will have 2 imaginary roots.
It depends on the specific version. I went to Casio's website to investigate. Both the "fx-115ES PLUS (2nd edition / NATURAL-V.P.A.M.)" and "fx-991ES PLUS C (2nd edition / NATURAL-V.P.A.M.)" offer RREF. I also can confirm that the "fx-115ES PLUS (1st edition / NATURAL-V.P.A.M.)" -- the silver and blue one -- also has RREF (I have this calculator in front of me. You'll want to look at the manual to make sure your specific version has RREF function since some of these calculators vary from country to country.
My old calculator died, it was a scientific one, should I buy a scientific calculator once again or should I upgrade to a graphical calculator I can't decide since you are an expert in this field, a piece of advice from an expert is always good. To help me pick up a calculator here is my edu, completed engineering just preparing for exams.
I know a good amount about calculators, but "expert" is a stretch -- I'll do my best to help. The big questions that I cannot answer: (1) What calculators are permitted for the "exams"? In particular, are CAS calculators permitted? (2) What calculator "died"; in other words, what model are you used to? (3) How much time will you have to get used to a new/different calculator? If you are allowed to use a CAS calculator, I'd recommend the HP Prime for lack of knowledge of the TI-89, NSpire, etc. But, HP Prime seems to be the most-recommended CAS calculator. If CAS is not permitted, I personally would want either the TI-36X Pro (in USA) or the HP 35S (warning, this is an RPN calculator, so probably not a good choice for you if you are coming from a more-typical scientific calculator).
It's very subjective. Both are great calculators. Between the 115ES and 991EX, I personally like the large font, more intuitive (to me) CALC and SOLVE, and the extra functions of the 115ES mentioned in the video (e.g. remainder division aka "modulus"). That said, the 991EX has better build quality, a much faster chip, and a dedicated x key. Personally, I prefer the 115ES. But I think a majority of people would like the 991EX.
I'm not sure what you mean by "fair". When I made the video, the two calculators shown were the editions offered in the US, so in that sense it is a fair comparison. But, at some point, I would expect Casio to release a 2nd edition of the fx-991EX Classwiz, probably with just very minor cosmetic changes. Thanks for leaving feedback, copes.
Not sure. Sort of depends what you need. You could download the documentation off the Casio website and look it over to see what you think is the better fit for you.
I discovered that the fx-115ES PLUS 2nd edition calculates with an accuracy of up to 60 digits! 8777÷61 = 143.885245901639344262295081967213114754098360655737704918032786 To get such an answer you have to: SHIFT, SETUP ➞ arrow down (next window) ➞ 6:Rdec ➞ Recur Decimal? 1:ON After getting the quotient answer, press the S⇔D button. 🥰🥰🥰I verified this result with Derive 6 math software on a desktop computer. Everything is correct.
I double checked w/ Wolfram Alpha *and* verified that I got the same answer on my fx-115ES PLUS 2nd ed. That is truly impressive! I am also impressed that you figured out that it would do this. Thank you for sharing this find. It is one of the more interesting things I've learned about these calculators in a long while.
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Thank you for taking the time to make this demonstration. I just ordered an fx-991ex as a replacement for my 30+ year old fx-991n. The LCD display in the 991n finally gave out. The 991ex has many, many more functions to offer than the 991n, most of which I'll probably never use. However, it is nice to have tools on hand just in case a need does arise or just to play around with once in a while.
I also have an fx-160 that I got in Singapore circa 1980. It is still going strong!
Glad you found it helpful. I hope you enjoy your new fx-991EX. The build-quality of Japanese products (including cars) in the 1980s was amazing. Thanks for leaving a comment, Lee.
Thank you so much. I have the fx-115ES PLUS and sometimes I have to wait for some seconds for the SOLVE. I've been looking for this SOLVE duration comparison which I could not find from anywhere else than here. Thanks a lot. I am ordering 991 right today.
Really happy you found it helpful AND took the time to let me know. Happy 2022 (soon if not already).
The spreadsheet mode is such a life saver for me. Its saves me minutes of time spent on doing tabulated calculations. It's my favourite mode to use in an exam
I am not in the habit of using this functionality, but good for you pointing out its usefulness. Thanks for leaving a comment.
I picked up the 991 roughly two weeks ago and love it. There's just something about the font that is easy for me to read.
Did you get the 991ES or 991EX? I'm assuming the ES. I really like the font and size of the ES even if it is a bit "old school" compared with the EX.
The dots are smaller in the high resolution display, in the EX.
We can make that even a little more complicated: I got the fx-991DE X, DE stands for deutsch/german. This version has the repeating decimal display, GCD/LCM, product function and a few other things. Kind of a combination of the two.
I really like the SwissMicros DM42, I grew up with RPN and that‘s how my mind works.
Greetings from Switzerland!
The calculator world is strange -- much more regionalized than I would have expected. The fx-991DE X sounds like a great calculator -- my biggest gripe is the display font, as I think they could/should have made it clearer and less stylized.
As for RPN, I am definitely a fan -- an HP28S was my constant companion through engineering school.
But, for most of the work I do these days (high school math tutoring/teaching), the Casio is a better fit.
Thanks for the comment, Mr. K!
I would love to have the DM42 but the price is completely unreasonable. I will not pay more than 200USD they ask for a simple calculator similar to the ones Casio sells for 20 american bucks. It should be at least less than 100 to even consider ordering one.
@@Kirillissimus you have to cnsider the fact that the dm42 is a programmable calculator and also the fact that swiss micros is a small company also since rpn calculators are not hat common today they dont have as many customers as casio for example so for it to be worth it to them the calculators have to be a but pricey ubfortunetly tho you could get the dm 15 a great calculator not as hig tech as the dm42 but still great it is also not that expensive and the reason kt costs over 200 for you is cuz of delivery i live two coutries frkm switzerland so if i got one it would cost me delivery included around 175 euros or around 195 dollars
The Iberia version (Spain and Portugal) of the 991ex has all of those functions from the 115 es too (remainder division, gcd, lcm, intg and reccuring decimal input) it's pretty weird how Casio changes some of their calculators based on region. I think the Japan version also has a periodic table app
I really like the unit conversion menu on the fx-991ex. Freshman year of college I had a Casio with the unit conversion reference numbers listed on the calculator cover but decided to commit the reference numbers to memory since I worried that referencing the calculators cover during tests may raise suspicions that I was cheating with hidden notes on the calculator's cover following another student getting caught doing exactly that.
Yes, unit conversions are much more convenient on the fx-991EX. Funny that you actually memorized the list. Thanks for leaving the comment.
Great Comparison.
The different features in different regions has a lot to do with the local education systems. Calculators are allowed in tests, but only if they have or don't have certain features. A good example of this is the TI 30x PLUS and TI 30x PRO in germany... In a few german states, they don't allow some of the features that the pro has, so you have two, nearly identical calculators, except one is missing a few features from the other, to satisfy local education authority rules regarding what is allowed during tests.
when you realize that all the comments were replied to by Scott Collins
You got me.
Very valuable review, thanks! There is one glaring flaw in both of these calculators, IMO. Older and simpler calculators have a dedicated button for switching from decimal to scientific notation, something I constantly want to do. Instead, now we have the academically useful, but not very practical, SD button to switch from fractions to number representation quickly.
In chemistry, when evaluating significant digits, sometimes you need to align decimal points to determine the sig figs and then need decimal; sometimes you just look at leading digits and want scientific. Also, comparing calculation results to published numbers is tedious if you can't match the notations. Casio should have figured out a quick way to toggle back and forth. I would rather bury the "ENG" notation button (I never use it) in favor of a "FloSci" floating-point-to-scientific button. Even adding this feature to the SD choices in a rotating manner might be satisfactory. Any way to implement it with no more than two button presses is needed.
Another feature sorely needed that I cannot find so far is a way to store the solutions to the built-in equation solver for polynomials (Mode | EQN(5)) so that you can continue to calculate with the solution you obtain. Solving a quadratic in X does not store a root anywhere. It would make sense when viewing the solution to be able to exit to Mode 1 after viewing a root of interest and have the result in the X or M or even the ANS variable. Having all the roots saved of course would be even better, but not sure how to do it without more variables.
Otherwise, the fx-115ES PLUS 2nd Edition is a very useful calculator aside from the display lacking enough contrast.
Glad you found it useful, Simon. Thank you for leaving a well-thought out comment.
I think the "FloSci" is probably not a highly-typical use case, however, it might be really cool if you could simply set the "SD" key (called something different) to be more configurable -- that way it could do what you are describing and/or the way it works now. You could also set how many different things it cycled through.
The ability to save roots of a quadratic is something that the TI-36X Pro and the TI-30X Pro MathPrint (not sold in the USA) both offer.
I agree that the display on these calculators in general is not ideal. The SwissMicros DM42 is amazing in this regard, but costs about 10 times as much, so it should have a great display.
With all the different versions of the same scientific calc you would think Casio would implement the most basic feature of power-off memory protection to save your calculation history in Comp mode like TI does. Casio could rule the U.S. market.
It would be great if we could combine the features of the TI-36X Pro and the Casio fx-991EX. But, for some reason they each do it their own way. I think if Casio added power-off memory protection hardly anyone would know the difference (aside from calculator nerds like me).
TI must be paying Casio annually, not to include the feature. It is mutual agreement. (Just my opinion).
love the ex black look and chrome buttons 🖤 just bought one
Agree -- it is a pretty calculator. Enjoy!
The GCD and LCM are not related to the ES series but to the 115. I have the 991ES plus 2nd edition and they are missing
Baffling. These companies (Casio and Texas Instruments, particularly) and all their marketing games are confusing. Sorry to hear those are missing from the 991ES -- thank you for letting others know. It is the first time I have ever heard of an actual difference between the 115ES and the 991ES -- I incorrectly assumed they were just different names for the same device based on historical/marketing reasons.
Scott is ... pretty much in love with the Casio ES model 😀
It's a great little calculator for the money. But, love?... then we are probably talking about the SwissMicros DM42.
Sometimes the professional certification agencies don't allow some calculators. Example: NCEES known as the National Council of Examiners for Engineering and Surveying. But, what is very strange is that both of these Casio calculators are allowed in these tests.
Too bad we cannot get an answer from CASIO's mouth. There is some reason they offer both and with the particular functions they do. I think somehow related to standardized testing is a likely hypothesis.
Thank you for the detailed review. I was pondering between getting the es plus vs ex to replace my fx-991w due to the darkened lcd display and one of the main functions I use is the log 10 and thank you for pointing out the location of this key is there (same as my old cal) and that it doesn't rock on the table. I would have probably gotten an EX otherwise and regretted getting it. I'll order an ES plus and save myself money and headache. Thank you so much once again.
Glad you found it helpful. Thanks for leaving a comment. I think you'll be happy w/ the ES.
The complex number solutions of the equation can be displayed on the CASIO fx-991EX display as a separate real part and imaginary part. To do this, select Fraction Result ➞ 1: a b/c in the settings. Then the real part is shown in the answer as a separate mixed fraction and the imaginary part as a separate fraction with the sign of the square root in the numerator. 🥰🥰🥰
You sound like a true "power user". Thank you for sharing your knowledge. Best wishes.
Thanks for the comparison. Now that the 991ex is no longer available I am wondering if the 115ES Plus 2nd Ed would make a good backup? Yes there is the Ti 30X Pro MathPrint and it does have nice features such as the persistent memory but I like the Casio layout since I have using them for years.
YES. I think the fx-115ES Plus 2nd Edition would make a good backup. I actually prefer it over the 991EX, but I doubt most people would. The other thought would see about buying a 991EX used off ebay.
Thankyou so much for this, i used a 991EX and i gave it to my sis and bought a115ES plus and i felt bad about buying the wrong one(i wanted the 991EX) but now i feel way better with my calculator! Thanks again!
Good for you for helping out your sis! Glad this video helped you feel better about your 115ES. Thanks for leaving a comment.
So which calculator is better?
Nice comparison. I just received the fx-991EX and while it is great and I like the display and speed, my biggest complaint is the case color and use of the faux carbon fiber finish. I'm shade-blind and find it very hard to read the key labels (red and blue). Luckily it only cost me $15, or I would have returned it. It will still find some use as long as I don't need to mess with those extra functions. I'm now considering getting the fx-115ES as my main calculator, as it looks to be much easier to read the key labels with its light colored case.
Very interesting point about color blindness. Those are the sorts of things that often get overlooked. Hope the ES works out great for you.
I have noticed that I cannot get all of the features I want in any one calculator. item A is better on this Calculator, item B is better on that calculator, and item C is only on that one Canon.
the Casio Super Fx Plus Fx-5800p has formulas but misses other things, I have a Canon that has a better implementation of the constants (symbol and name), etc. etc.
So true. Cars are the same way, but they are much more complex. It surprises me that after all these years calculators are as different as they are. I recently concluded that you need to view as different types of wrenches -- they all do the same basic job, but excel in different situations.
That is why I own the best Casio, TI, Sharp and Canon advanced scientific calculators. I ended up with five but they all have unique features.
@@irishchocolate3872 I have 200 or so calculators, I also seem to utilize multiple to get everything I want
the fx-5800P is programmable, and cannot be used by students in most exams in Asia. It is not meant for students, as it has less "direct" function keys. However, the programming capability boosts its power and you can do many things like finding complex exponentials, cube roots, powers etc. It can multiply two 10x10 matrices, and hence solve linear equations in 10 variables!
Do you make videos on calculators? If yes, can you make one on fx-5800P?
Hi Scott, although the video is old, I hope you can see my commend and give me some advice. I'm looking for a replacement of my fx-991s (Bought around 1995 and it was still working ok, but it was stolen from me). That calculator had the particularity that it was really slim. Are these series 991ex, 991es plus 2nd edition, slim? The 991s was, I would say, slim as a current smart phone or even a bit less!
I just measured both calculators and they are right around 13-14 mm from table surface to top of buttons. Definitely thicker than my iPhone SE. I would not say that either calculator is slim, but they are both a bit thinner than the TI-36X Pro and Sharp EL-W516X. Hope this helps, Francisco.
I also want a calculator that can truly do base-n (not just base 10, 2, 8, 16, and 5 on certain Sharps) maybe I want to play with base 12, etc.
I have never run into a calculator that would do that, but I don't think it would be too difficult to program (for someone who actually knows what they are doing -- i.e. not me).
Excellent review. Thanks a lot. I've almost bought the 991 EX due to my ignorance 🙂 The fx-115ES is better because the EX lacks in certain features: Sigma summation is present but the product (pi notation) is gone, hyperbolic functions are gone, modulo operation is gone. Some operations require more key strokes. *For most people the EX is ideal and should be the choice* but those (very few, e.g. mathematicians) who want more serious functionality and less key strokes should opt for the fx-115ES. I mean the EX is a perfect calculator because the operations removed from the EX are not needed for an average student. If you need hyperbolic functions, capital pi, then the fx-115ES is the way to go. For me removal of the above is a huge dumbing down!
All good points, Bill. Glad the video was helpful to you. Thanks for leaving word.
when i press ON or HOME or if the calculator is off, all calculation history is gone. Is there anyway to keep the calculation history?
None that I am aware of -- in fact, this seems to be something people dislike about a generally well-liked calculator. The TI-36X Pro and TI-30X Pro MathPrint maintain calculation history even after being powered off. Here's a video I made about the latter -- th-cam.com/video/KcN9guPLwRQ/w-d-xo.html
thank you Scott. your videos help me so much, much love from Saudi. شكرا لك من اعماق قلبي
I appreciate you letting me know you found it helpful -- always fun to hear from people around the world like Saudi. Take care.
Is the 115ES somehow discontinued? I cant even find it on the official Casio catalog
In the US it is still sold (www.casio.com/us/calculators/scientific-fraction/), but in other markets it might not be. I do think, though, that in many markets it is called the fx-991ES (www.casio.com/intl/scientific-calculators/product.FX-991ESPLUS-2/).
Thank you !@@scottcollins7513
It seems like the 991 was almost built for the professional engineering exam. The extra memory allows for complicated solving with much less lag time than is offered on other approved models (the fx-115 and ti-36x). I began my studying with all three, I used the fx-115 through college and the FE, for me the fx-991 was the obvious choice.
The processor in the 991EX is on a completely different performance tier. I just wish they offered a setting to emulate the larger, more-readable font of the 115ES. But, I don’t claim to have the best eyesight. Good for you for pursuing a PE, btw. Oh, one other comment - I wish all three calculators were more adept with vectors; they are clunky compared with HP48GX; even the HP42S is more adept.
@@scottcollins7513 I just noticed that there is a "second edition" 991 available an Amazon. It looks like it has the larger font.
@@metatechnologist Is it the 991ES or 991EX? I'm guessing it is the 991ES which in other markets, as I understand it, is the same as the 115ES in the USA.
@@scottcollins7513 It appears not to be. It's listed on Amazon as fx991 ES plus 2 and above the display there's a " second edition". It's like a 991 but has black keys now.
@@metatechnologistThat sounds like it is just the black version of the same calculator (115ES) I have in the white version in this video. Thanks for the info and for taking the time to leave a comment.
Had to make this choice today, I ultimately went for the newer FX-991CW with the simplified layout because I thought it looked aesthetically pleasing. The cover clips on instead of sliding, which becomes very loose over time as each slide wears down the bumps that hold the cover in place. Time will tell if I will get tired of digging through menus for more complex stuff 🙃
Definitely weird pricing, both were $20. Even without considering design, the faster, sharper calc just seems like a better deal.
Thanks for leaving a comment. I think I will likely pick up a fx-991CW and make videos about it. I agree that the CW is likely the better value for most people, even if personally I like the fx-115ES PLUS 2nd edition.
So which do you prefer of the calculators: fx-115ES PLUS 2nd edition, fx-991EX, or the TI-36X Pro?
For mathematics I prefer Casio. For engineering I prefer TI. But it is close.
Between the 115ES and 991EX, I personally like the large font of the 115ES and the extra functions, but the 991EX has better build quality, much faster chip, and dedicated x key. Personally, I prefer the 115ES. But I think most people would like the 991EX.
You can't go wrong with any of the three.
@@scottcollins7513 Which version of TI is good for Engineering
@@medotedo8410 It depends on what calculators they allow you to use on tests/exams. I like (but don't love) the TI-36X Pro.
I think it's good to upgrade to fx-570es version. Maybe it's more features.
@@scottcollins7513 Hi, maybe you know that, on the European market available the upgraded version of the 36X Pro, the TI-30X Pro Mathprint (education.ti.com/de/products/calculators/scientific-calculators/ti-30x-pro-mp ). This calculator is the most powerful non-graphic model on the market.
It can handle functions like (in table mode): g(x)=d/dx(f(x),x). With this feature you can calculate in one table the function values and it's derivative. Of course, this is available on 36X Pro also, BUT you can use it also when you leave table mode eg. in this way: (g(x+a)-g(x-a))/(2a). With this feature you can calculate numerically second derivative values. I guess the memory can handle the numerical solution of the above and you can easily find the inflexion points.
The g(x)= something function of f(x) is not available on any CASIOs, so I am sure the TI-30/36 line is the best if you do not want a graphing calculator or not allowed.
i guess the es suits me more , thank you !
Scott, any of this calculatros are able to solve matrices with complex numbers in it? Thanks in advance.
To the best of my knowledge none of this level of scientific calculators (from Casio, Texas Instruments, and Sharp) can do what you are looking for.
The hp Prime and SwissMicros DM42 are able to, but they are at a much higher price point.
@@scottcollins7513 Thank you very much Scott, i was thinking of buying one, but now i will reevaluate.
ES Plus is the older one, they just released it in a different from factor. They also released fx-82MS as a second edition.
I wish they would have improved the processor and the display when they released the 2nd edition.
Which is better for mechanichal engineering and why. Thank You :)
First, you probably should talk to people at the school(s) you plan/hope to attend to get a feel for what calculators are permitted / best for the particular school. Different colleges have different rules/philosophies. In the price range of the two CASIOs shown in the video, there is also the TI-36X Pro. I am not a TI fan, generally speaking, but out of the 3 calculators, the TI-36X Pro would be my choice for engineering b/c of how it allows you to easily reuse previous expressions and results in a very easy way.
Not to complicate things, but the TI-30X Pro MathPrint is even better than the TI-36X Pro if you are either located in UK/Europe *OR* are willing to spend $40 for a calculator that is maybe 10-15% better than the TI-36X Pro.
I actually bought the casio fx-991 ex classwiz recently but it happened to have lines flickering and also the screen is not clearer even if i increase the contrass please can you tell me whats the problem.
That sounds like a defect. I would suggest that you return it or exchange it for another if possible.
@@scottcollins7513 wow thank you for replying i will now call for an exhange
Fantastic video! Any idea how the fx-991ES Plus C compares to the 115ES and 991EX?
Hi, Miss Dori. I do not know. My understanding is that the fx-991ES is very nearly the same as the fx-115ES, but these calculators are regional by nature, so it is next to impossible to keep track of the minor differences.
the fx-991 ES Plus is almost the same as 115ES Plus, but it does not have LCM, GCD, recurring decimals, Intg, etc.
The fx-991ES PLUS C (2nd edition) has exactly the same functions as the fx-115ES PLUS (2nd edition). I personally like the fx-991ES PLUS C more for its color choice (black).
Unfortunately, it cannot be bought officially in Europe. I have both of these calculators that are discussed in this video. Apart from them, also fx-991ES PLUS (2nd edition).
However, the latter has fewer functions than the fx-991ES PLUS C.🥰🥰🥰
Does FX-115ES Plus have a QR code?
No.
Thanks for this detailed comparison. There are a couple of points I can add, in the last generation's favour as it happens:
- if you use X as your variable in solve mode you don't need to specify it after a comma (at least on my fx-991ES and I imagine it must be the same on the fx-115)
- while the thousands separator on the new generation is nice, it's less important if you're doing something like engineering. Then you can specify Sci display mode and automatically get results in scientific notation meaning there are no thousands to separate. I do wish there was an automatic engineering notation feature so that you wouldn't have to press ENG all the time which would be even better. I don't know if the new generation has this?
- You are correct about not needing to specify "x" after a comma when it is the variable you are solving for on the fx-115 ES Plus (1st and 2nd Ed).
- The 2nd Ed does NOT have a dedicated ENG mode. Both the SHARP EL-W516X and the TI-36X Pro *DO* have this feature
Thanks for leaving the comments, Ernst.
@@scottcollins7513 Interestingly, I just bought the German version of the fx-991EX, the fx-991DE X. It has (as far as I can tell) all the missing features from the fx-115ES+. This makes sense, since essentially the same model as it used to be sold in Europe as the 991DE. Unfortunately the interface is only in German and cannot be changed to English. There also exists a Japanese variant apparently with even more features, the fx-JP900. It can be changed to English but has physical button text in Japanese. It's also rather expensive to buy in Europe as you can imagine. Thanks for the tips about ENG mode.
Edit: I believe the 2nd gen *does* have an engineering mode, called "Engineer Symbol" in the English version. Even better, it displays (you can also enter) with SI prefixes, which is something I have previously only seen on Casio's graphical calculators.
@@ernstliebleid587 Good information. I did not even think about the fact that it would be in German language, but makes perfect sense that it would be.
Also, interesting about the SI prefixes. I have seen that before, but forget which particular calculator. I may need to explore that further.
Thanks for leaving helpful comments!
In my region, almost all the extra features you mentioned in 991es/115es is absent. So 991ex looks like the best choice.
It is unfortunate that the same model has different features depending on the market/region. I think the 991EX is going to be the better choice for most people. It has a much faster processor and better screen. In your case it sounds like the 991EX would be the clear choice. Thanks for the info. By the way, what region of the world are you in? My videos are typically of the US models. Take care.
@@scottcollins7513 Ohh thanks for the response! I live in India. It's pretty annoying that they remove features based on the region, I don't even know why they do that. This video was very helpful to me. Take care!
@@abhinavg3348 Glad the video was helpful to you. Thanks for the reply regarding your region of the world -- so cool that on TH-cam we are all "neighbors". Take care.
I have deli es 991 plus editon.
Casio also offers 991 es plus edition.
Are they same??
I do not know. Casio seems to change functionality based on the region. If worth the hassle, you could download a manual for your region and compare functions.
Casio Classwiz fx-991EX is good and the others regional versions too, but the best is the vesion of Spain, it has more functions than American version and than others regional version in the world. I recommend check out it, greetings.
I've heard the German version also has additional functions. Had not heard about the Spanish version, but good to know. Thanks for letting me (and others) know.
How many functions in both?
Not sure -- I think you could probably find out from Casio's website if it really matters to you. They both are very full-featured for the price point.
Why Casio made an update taht is not un update? The 115es plus 2nd Ed. looks like the 991 (es?) German Edition. The normal edition (not plus) has no added functions similar to the one sold in Italy - no lcm, no recurring number, etc). Are the 115 the Us models of the 570/ 991?
All the different variations and model names based on different regions of the world makes it all confusing. My understanding is that the US 115ES is the same as Europe's 991ES.
@@scottcollins7513 yes. But we don t have the choice of boying, even if old, the 115 plus version with gcd and lcm, for example, and there are at least other 8 main missings plus others, someone listed them in the Amazon section. There is the german version 991 DEX which includes at least some(?) of the 115 es plus 2nd edition functions, reaching a total of 686 functions). I am feeling upset, honestly. Also, here everybody idolizes the 991 ex "international version" while Casio make fun of us.
@@scottcollins7513 tjanks for the comment by the way. Your comparisons are always informative. Pity they are so short!
@@MrMarcec85 Glad you enjoy them -- thanks for saying so. Sorry to hear that the Casio models in your region are missing some of the best features.
@@scottcollins7513 if I can exploit your kindness, I have been looking at TI 30x pro mathprint (that should be "your" 36x) and I have seen that it has abs, lcm, gcd, Poisson and probably other stuff. It lacks the pre-ans function and the disequation solver (the few things I was able to quickly check) but it seems more complete than the fx 991... "standard". I have never used TI. Is the 991 ex better even with missing functions? I have been reading of hundreds of positive comments about Casio but nothing about the TI...
I absolutely love the 991 ex it feels like my best investment worth every penny. It's sad the upgraded version to this much loved boy didn't get as good response. Nonetheless I will get a 991 CW anyways I just don't want to miss on the update to spreadsheet mode which keeps the data intact even when changing mode unlike what it's like in the EX
I did not realize the CW offered that advantage. thanks for sharing the info.
I just bought a new Casio fix-991 ex but it won’t turn on when I press the “ON” button do you know why ?
That sounds like a bad battery. Even though it has solar panel, my understanding is that it still also needs a healthy battery.
Which should i buy ?
I am civil engineering student and also i need to do python coding calculation
I do not know much regarding calculators that are best for Python programming. I would recommend you check out www.reddit.com/r/calculators/ since I have seen discussion of this sort of topic on that subreddit. Thanks for asking -- sorry I was not more helpful.
There are no calculators that are made specifically for Python programming, but any calculator that has a BaseN mode will help you in conversions and basic logical operations.
The fx-CG50 graphing calc has Python, but you won't be allowed to use it in exams.
Here in the US we have the Texas Intruments "Ti-84 Plus CE Python Edition". It can do Python programming. Is this what your looking for? I don't know much about math stuff. But I have seen this calculator before here.
5:33 You are a cruel person for not closing the parentheses lol. Thank you for the useful comparison.
Function over form -- save those keystrokes for when they are actually needed! Thanks for leaving the comment. Take care.
The most preferable feature of the 991 Classwiz the Solver which can handle the d/dx() and integrate() functions. With this feature you can solve all kind optimization problems and all the separable differential equation solving problems, like this Clausius-Clapeyron integration: th-cam.com/video/RMSq6b7Obgg/w-d-xo.html
I am a mechanical engineer and with my fx-991 I can solve easily integrate() + Solve problems, like Betti's theorem examples for beams.
You may have just made my decision for me! Shame the 991 is so ugly 😭
@@daisydo7669... or you can choose this one: www.datamath.org/Sci/Modern/TI-30X-PROMP.htm
What's up with the 300ES? Another confusing "2nd edition" addition to their lineup that looks super similar.
Add in the different names and even different capabilities (e.g. supposedly the 991EX in Germany has more functions than the 991EX in the USA) for different world markets, and it gets really wacky.
@@scottcollins7513 In Germany they have the fx-991DE X, 87DE X in addition to the 991EX, and they have 82DE PLUS, 85DE PLUS, 87DE PLUS, 991DE PLUS. The 991DE X and 991DE PLUS have those 115ES PLUS functions.
@@Crazytesseract Amazing how many different versions of these calculators CASIO and others sell -- and how they differ from region to region. My current USA favorite is the fx-115ES PLUS 2nd Edition. The dream version would be your 991DE PLUS or 991DE X with the fast chip and the nice-looking high-resolution display, but with the option of the large font used on the fx-115ES PLUS 2nd Edition which I find ideal.
@@scottcollins7513 Note: I am not German, but Indian... but i am aware of almost all regional variations.
Is there any difference between this 115 es plus and the older model?
Minimal. Here's a quick comparison: th-cam.com/video/XG64PxAh-Vc/w-d-xo.html
@@scottcollins7513 Thank you
Hi, mind sharing which calculator is better for engineering?
Of the two, I think most would choose the EX bc the small font would not bother their eyes and the much faster processor would come in handy now and then. That said, I would pick the TI-36X Pro (or comparable model if you are outside US) over either Casio bc of the way it allows easy reuse of previous results.
Why the German version 991 DE X has all functions as 115ES 2nd (GCD, LCM, periodic numbers, verify...)? Original 991EX or CE X has not these functions... it is strange.
I agree - it is strange. I think it must be because of standardized tests prohibiting certain functions. Happy that at least Germany gets a more full-featured version. Wish we did.
On the TI-86, for 3x^3 -ln(x) = 10, i get x=1.5141803007514 but L-R = 1.3 E-12. Then, i have graphics on that TI, and i see something interesting for this function, for example there is a bottom. How would you find it ? The min of that function.
3x^3-ln(x)=10 is not a function, but rather an equation. x=1.51418... is an approximate solution to this equation.
What did you graph on your TI-86? I'm guessing you graphed y=3x^3-ln(x). To find the minimum would require using calculus to find where the slope of the tangent is zero, but that is something different than solving the original equation.
Off the top of my head, I do not know how to solve the equation algebraically. I would resort to using an approximate solution (e.g. graphing or a calculator's solver).
How would i purchase the EX? I am in Canada and want to buy a non-counterfeit calculator.
I would think you could buy one from a US-based retailer -- if none of the big stores ship into Canada, maybe a college book store would work -- I bought my UK TI from a UK-based retailer. Are you sure that Casio does not offer the calculator you want locally? Seems like Canada would have a version.
Casio Canada lists the model on their website: www.casioca.com/products/calculators/fraction-and-scientific/fx-991ex
I'm guessing you could reach out directly to Casio and ask for a list of retailers.
In my casio fs 991 EX, there are not displaying the solar symbol.. What can i do?.. I am from Bangladesh
I do not know what to suggest. Are you confident that the calculator is a CASIO and not a knock-off / counterfeit? I'm assuming you are using it in a well-lit room. If you are confident it is a CASIO, you could contact them about potentially getting it replaced if it is still under warranty. Sorry you are having a problem w/ it.
Very useful. Thank you for your help.
Great. Thanks for leaving a comment, Salman.
I barley got the second edition but i didn't do my research how do you find an exact answer of pie on it
I'll try to help you out, but I'm not clear on what you are asking. There is a constant for pi built-in -- it's a SHIFTed function of the middle key in the bottom row ("x10^x").
@@scottcollins7513 so if i have to solve a question for the area of a circle when i plug in 2 pi r it doesn't give me an answer thank u for helping
I think what you need to do is press the “S-D” key (that will toggle between Symbolic and Decimal approximation).
Mine, 991 lax sits perfectly flat. Either with the case on or off, it doesn't move in the slightest way.
Interesting. I'm guessing mine is slightly out of spec or something.
which one feels better? i need one that doesn't have mushy buttons
Go with the 991EX. It has the better build quality in my estimation.
In the calc mode what is L-R ?
It is letting you know the difference between the left side (“L”) and right side (“R”) of the equation when solving via iterative solve. Typically, you should see “L-R=0”, meaning it found an “exact” solution.
can this display previous calculations?
Yes. As long as you stay in the same mode (if you switch to another mode, like imaginary, then you will lose your calculation history) and the calculator does not power off due to inactivity, you are able to look backwards through your previous calculations on both calculators. Exactly how much history each keeps I do not know.
hello!!! does the classwiz equal fractions?
It does reduce (e.g. type in 3/15 and the calculator simplifies it to 1/5), if that is what you are asking.
HP use to make dedicated calculators. About the only one they make now is the HP-35s. It is great for engineers but not so much for students.
Casio also offers the new fx-991ms 2nd edition which is similar to the 115 es plus but with S.V.P.A.M. instead of textbook display.
I may need to try out an HP-35s.
I have a Casio fx-115 MS (the original). It has a truly annoying bug that it recalculates the value when you store it to memory. This does havoc when you use Ans. If you calculate 5 = , Ans + 2 =, Sto A, then A will be 9, not 7 like in other calculators.You can avoid his by entering: Ans Sto A, but it is easy to forget this.
The nice feature of MS series is that functions do not open parenthesis so you do not need to close them either.
s vpam is terrible unless if you want to save money, natural vpam or even classwiz is better
Which can I buy? Which is better? Which can solve equations more faster than other one ? please, suggest me !
If faster is a priority, get the EX. It has a much faster processor.
I think Casio FX-JP900-N is just fx-991EX with those features from fx-115ES PLUS 2nd edition. You can change the display language from Japanese to English if you wish for the FX-JP900-N.
Good information! Thanks for leaving a comment.
@@scottcollins7513 I have an FX-JP700-N, which is a trim down version of the FX-JP900-N. But I still have the GCD, LCM and mod function.
Greetings to you from Egypt.
Thanks for leaving a comment -- cool to hear from Egypt of all places. Best wishes.
@@scottcollins7513 You are most welcome and with my best wishes to you for permanent success.
How do you do unit conversion 😅
th-cam.com/video/z_DEuYNVMho/w-d-xo.html
Get the Japanese version of fx-991ex. That model has all the features you could imagine of.
I’ve heard the same about the DE (German) version. Too bad neither is offered in the US.
Hay, look. The are Casio FX-92+, FX-92, FX-92B with the same design and with GCD, LCD, ÷R functions, and even a programming by blocks mode in fx-92+
Maybe it is the reason why Casio restricted fx-991ex. But unfortunately they are only in French, except 92B
th-cam.com/video/K2eZ--Te17w/w-d-xo.html
It is strange how many variations CASIO makes for their scientific calculators. And, on top of that, how they vary by region. I suppose part of it is due to the many different world languages. I think part is also due to all the different types of standardized tests taken and what calculator models are officially approved for the specific test. Crazy variety. Thanks for leaving a comment, Andrey.
How do you enter x on the es?
You will press ALPHA key and then the ) key.
which one is better, 115esplus 2nd edition vs 991cw ,, help
First question is do they sell the TI-30X PRO MathPrint (must be MathPrint) where you live? If so, THAT is the one to get.
If not (for ex if you live in the US), then I need to know what are you planning to use it for.
SD (Standard and Decimal)
Thanks!
@@scottcollins7513 Your very welcome! Great video, It was nice to see the diffs between these two models. Though I am not sure why they left GCD and LCM off the US model of the 991.
@@dalhend My best guess as to why the US gets a "watered-down" 991EX is either related to standardized testing approval or as a marketing ploy to eek some more life out of the 115ES (991ES). Not sure. I have heard that the German "991EX" has all the features that the US version is missing. Strange. Thanks for the kind words.
Very good video with relevant, useful information.
I appreciate the encouraging feedback. Thanks for leaving a comment, Mark.
At least in Germany there are various federal states with conflicting opinions what’s allowed in exams. Casio has several models according to these restrictions.
After the exams, like in your job, you’d used the unrestricted one to make things easier for you.
I think this must be what is behind all of the (baffling) variations in models and the way they differ by region/country.
I want to get the 115ES cause I used the 115EX all through my engineering undergrad and I'm very familiar with it. I want to use the get the 991EX cause it looks a lot more intuitive and I don't want to peek on the back of my calculator for unit conversions during standardized exams! But also the 991EX is so ugly 🤢
Decisions decisions
For engineering work, I think I would rather use the TI-36X Pro (than the 991EX or 115ES). Or, you could get really adventurous and consider the HP 35S.
@@scottcollins7513 thanks for your response! Is that just because they save your history after you turn them off or are there other reasons?
@@daisydo7669 Happy to try and help. My main reason is not the saving of history (though that is a plus). My main reason is because of how much easier it is to reuse previous results without having to save them. I demonstrate this advantage at beginning of this video --> th-cam.com/video/beUZrvdnPG8/w-d-xo.html
If you were happy w/ the Casio approach, you would certainly not be crazy to stay with the brand.
Wonderfully explained
Thanks so much! Glad you liked it.
Why didn't they make a 115EX for the US market?
I’d love to understand the marketing gymnastics at work. And it’s not just Casio. TI is a US company yet they continue to sell an outdated version of the TI-36X Pro when Europe gets a new version (but sold as a TI-30X Pro Mathprint or something like that). Baffling.
@@scottcollins7513 The fx-991DE X has the functions of 115ES PLUS, but it is in German.
@@Crazytesseract Good point about the language difference -- that might be tricky!
@@scottcollins7513 Thanks for your reply. But it might allow you to switch to English, I'm not sure. The fx-JP900 (Japan specific), has the English option. If you could get it, you will have a "115 EX", plus atomic weights and many more unit conversions.
(But I don't really need all that, so I am ok with the 991EX for now.)
A Casio fx-JP910 might be on its way. Btw I am from India.
Can someone please confirm if any of these two calculators can be used on FE exam?
Both can be used according to this site: ncees.org/exams/calculator/
@@scottcollins7513 👍
Thanks for confirming.
My Casio 991ex came without a constants card under the cover.
The EX shows a symbol in the graphical display, so they must figure that is sufficient. My EX is the same as yours -- no decal/card.
@@scottcollins7513 Thank you for your reply.
Have an ACT test coming up
Hope it goes great for you -- good for you for getting more-familiar w/ your calculator ahead of time.
@@scottcollins7513 thank you
Now I am pretty sure that I have to buy Casio FX-991ES Plus-2nd generation because I will be appearing for NSEJS (an Indian exam) I must have some feature which are missing in both of these calculators in the video. We do not use calculators very often in India especially students under 12th grade but I must buy one..........
I think you will be very happy with it. Hope your NSEJS go great for you!
which has better display / contrast? Most TI calculators I worked with, you can't read when it is flat on table, you have to hold it in hand to read it, so that display is it at an angle. Thanks
Neither display is particularly good, Sartaj. I prefer the ES b/c the font is bigger and the fonts are clearer (e.g. the "6" is overly stylized on the EX, causing it to look too much like an "8" in my view). I would say the displays are on par w/ the TI displays. Your criticism is valid for every LCD calculator I have ever used -- some are better than others. The DM42 is the best, but it should be for the price.
So for an engineering student which do you recommend?
The fx-991EX has a much faster processor. That’s what I would choose of the two in this video. That said, you should also consider the TI-36X Pro (slower processor than the 991EX, but I like the way you can easily reuse previous calculations). I have a video comparing the 991EX and the TI-36 that you might find helpful.
In Germany we get Fx991De x it has all the features your fx 991ex is missing
Wish we had that version in the US. Enjoy it!
In fact I wrote to Casio telling them, for what they could care, they gave lost a 60 years- long client. And that make this market policies, considering we are the EU, is very childish.
@@MrMarcec85 Don't feel too bad. Here in the US, the home of Texas Instruments ("TI"), they do not offer the latest version of the TI-36X Pro -- we still get the old version. It's so strange all the marketing games played by the different manufacturers. I think part of it may be related to the standardized testing market -- not sure.
In Asia there is a pink girly version of the fx991 where the text above the keys is better readable than on the black one.
@@hermask815 I'll stick with white, thank you.
Which is better?
No simple answer, but I think for most people the EX is going to be better.
Ok, the fx-115es isn't available right now in Europe.... But why do you get an imaginary number while solving aX² + bX + c ?
Using the quadratic formula to find the roots of a quadratic expression (ax^2+bx+c), you will get two imaginary roots any time that b^2-4ac (called the discriminant; it's the part of the expression under the square root symbol) is less than zero. If you graph a quadratic expression y=ax^2+bx+c and it fails to cross the x-axis of the graph, it means it will have 2 imaginary roots.
@@scottcollins7513 Well it means that now. Longtime ago, it ment that there were no solutions...
@@laurenth7187 Ha! Great point!
Can i find rref in 991ex
It depends on the specific version. I went to Casio's website to investigate.
Both the "fx-115ES PLUS (2nd edition / NATURAL-V.P.A.M.)" and "fx-991ES PLUS C (2nd edition / NATURAL-V.P.A.M.)" offer RREF.
I also can confirm that the "fx-115ES PLUS (1st edition / NATURAL-V.P.A.M.)" -- the silver and blue one -- also has RREF (I have this calculator in front of me.
You'll want to look at the manual to make sure your specific version has RREF function since some of these calculators vary from country to country.
My old calculator died, it was a scientific one, should I buy a scientific calculator once again or should I upgrade to a graphical calculator I can't decide since you are an expert in this field, a piece of advice from an expert is always good. To help me pick up a calculator here is my edu, completed engineering just preparing for exams.
I know a good amount about calculators, but "expert" is a stretch -- I'll do my best to help.
The big questions that I cannot answer:
(1) What calculators are permitted for the "exams"? In particular, are CAS calculators permitted?
(2) What calculator "died"; in other words, what model are you used to?
(3) How much time will you have to get used to a new/different calculator?
If you are allowed to use a CAS calculator, I'd recommend the HP Prime for lack of knowledge of the TI-89, NSpire, etc. But, HP Prime seems to be the most-recommended CAS calculator.
If CAS is not permitted, I personally would want either the TI-36X Pro (in USA) or the HP 35S (warning, this is an RPN calculator, so probably not a good choice for you if you are coming from a more-typical scientific calculator).
Which is best??
It's very subjective. Both are great calculators. Between the 115ES and 991EX, I personally like the large font, more intuitive (to me) CALC and SOLVE, and the extra functions of the 115ES mentioned in the video (e.g. remainder division aka "modulus"). That said, the 991EX has better build quality, a much faster chip, and a dedicated x key. Personally, I prefer the 115ES. But I think a majority of people would like the 991EX.
@@scottcollins7513 thank you for guide me
6:34
Little things like a dedicated x key can make a noticeable difference. Good highlight, Antuan.
The rocking case is easy to fix with a sheet of sandpaper.
Good tip. Thanks, Jess.
the fair comparision should be 991 es plus vs 991 ex
I'm not sure what you mean by "fair". When I made the video, the two calculators shown were the editions offered in the US, so in that sense it is a fair comparison. But, at some point, I would expect Casio to release a 2nd edition of the fx-991EX Classwiz, probably with just very minor cosmetic changes. Thanks for leaving feedback, copes.
@@scottcollins7513 oh so the 991 es plus is renamed 115-es plus on the us, ok i get it
Which could be more better for more functions?
Not sure. Sort of depends what you need. You could download the documentation off the Casio website and look it over to see what you think is the better fit for you.
@@scottcollins7513 tq 😀
Thank u
You are welcome.
So... I need both.
Or get the GERMAN version -- the fx-991DE X -- which is the best of both worlds, other than the larger font of the ES.
Just checking in you still replying Scott
Yes, still out here.
@@scottcollins7513 🤯👏
YOU SKIPPED: 2nd sd
Gives a whole # plus a fraction
For example...
11/10
2nd sd 1 1/10
Good info. Obviously, the video only covers a fraction (no pun intended) of what the calculator can do. Thanks for leaving the tip.
I discovered that the fx-115ES PLUS 2nd edition calculates with an accuracy of up to 60 digits!
8777÷61 = 143.885245901639344262295081967213114754098360655737704918032786
To get such an answer you have to: SHIFT, SETUP ➞ arrow down (next window) ➞ 6:Rdec ➞ Recur Decimal? 1:ON
After getting the quotient answer, press the S⇔D button. 🥰🥰🥰I verified this result with Derive 6 math software on a desktop computer. Everything is correct.
I double checked w/ Wolfram Alpha *and* verified that I got the same answer on my fx-115ES PLUS 2nd ed. That is truly impressive! I am also impressed that you figured out that it would do this. Thank you for sharing this find. It is one of the more interesting things I've learned about these calculators in a long while.
I feel like the TI 30X PRO MathPrint is better than both of these calculators in many ways.
AGREE. But, it is not sold in the USA and to get one from the UK cost around $45 USD. For that money, I would stick w/ CASIO or the TI-36X Pro.