(5 + 4) times 2 minus 6 divided by 2 =? A BASIC Math problem MANY will get WRONG!
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- เผยแพร่เมื่อ 15 พ.ค. 2024
- How to do a math problem using PEMDAS - order of operations. Learn more math at TCMathAcademy.com/.
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(5 + 4) x 2 - 6 / 2 brackets first
9 x 2 - 6 / 2 now multiply
18 - 6 / 2 now divide
18 - 3 = 15
Solved in my head at the thumbnail, the answer is d) 15, thanks to PEMDAS.
0) ( 5 + 4 ) 2 - 6 / 2 -- Starting state
1) ( 9 ) 2 - 6 / 2 -- Parentheses
2) 18 - 3 -- no Exponents, so Multiplication and Division, from left to right
3) 15 -- Addition and Subtraction, left to right. Final result.
Yep, same here.
Same here too!
They will tell me 15 but I still say b
got it 15 thanks for the easy PEMDAS
15
got it correct because of "Please excuse my dear aunt Sally"
love it
I really enjoy your TH-cam videos it has truly helped me and give me a little bit of courage I truly feared and thought I was horrible at math I was afraid of these types of basic math because they were so traveling for me but you really explain the PEMDAS and I like How are you explain it if the vision is first you do it first if multiplication is first you do that first if addition is first after multiplication and division you do it first and order some traction as before the addition you do it for us thank you so much you’ve made life a little more easier for me I’m gonna have to watch probably 1000 more of your videos
I love your videos. I learned the PEMDAS and now solve your challenges quickly (without watching the entire video). A+++
Because I have been doing your lessons I figured this out in about 30 seconds. PEMDAS first. OOOPPS! Got six but I was way close. Silly mistakes will get you everytime.
D. 15 PEMDAS in my head
We were taught BODMAS which stands for: Brackets, Of(powers/roots), Division, Multiplication, Addition, Subtraction
Thanks for explaining
Love these math moments in my day 😊
😮I disliked school and I hated Math. (I then taught school for 31 years, not math, but art). Maybe one of the reasons for my dislike may have been because some things were not explained sufficiently. I never heard of the acronym, PEMDAS ever when I was at any grade level in schools. I’m so glad i noticed this video, and will be brushing up on my math skills. (I did learn to love my students and I almost wish I had not had to retire at all).
I made it 15. Taking in mind the ‘BODMAS’ rule!
My 80 year old brain still works! The answer is 15😊
D 15
According ro Bodmas formula 15 is right answer
Thank you
9*2-6/2
18-6/2
18-3
15
15 is the right answer. Bracket first then division, followed by subtraction
Solved in my head in 15 seconds.
Wow
Good mental maths problem no calculator needed
15 but where in the real world would one see such a math problem? Like at Walmart or at the grocery store is what I mean?
In a poorly written piece of software.
Hi 👋☺️👋 thanks 👍
Good job
D. 15
D15
d. 15
b) 6
My answer as well, but it's wrong. 15 is correct
All you need to say is: Division BEFORE Subtraction.
d) 15
Wonderful teachings. Thank you 🙏🏾
Answer: 15
D: 15
d is right answer
I learned that the thing to remember was BODMAS.Worked for me😊
ANWSER: 6 FIRSTLY: left brackets, then multiplication, NEXT: division THEN subtraction
You seem to have got the sequence of operations correct, but 18 - 3 is not 6. It's 15.
@@gavindeane3670 oops!
@@gavindeane3670 The division component is in a virtual bracket and the expression therefore was probably a little disingenuous
@@imagseer It's not disingenuous. It's intentional. The entire point of it is to teach the precedence rules. It's the basic grammar of mathematical notation.
D
D 15 no calculator
using the rules x divided by y is the same as x times y inverted. And x - y is the same as -y + x. This turns the convoluted and controversial PEMDAS into PEMA or as I love to call it Please Excuse My Alcoholism. With that fun out of the way lets apply it to the question at hand:
re write:
(5 + 4)2 for the first set and (-6 * 1/2) for the second set
(2 *9) is 18 and -6 * 1/2 is -3
New Problem:
-3 + 18 = 15
final answer 15.
15
You have not followed Bodmas. Brackets, off division, multiplication ,addition subtraction.
THIS IS BETTER THEN SUDOKU AND CAN BE FUN
Is it 15?
Bidmas ans=15
Fun.
15!!!!
d
15. PEMDAS is absolute!
PEMDAS is only recognized in the USA and France. BODMAS is the equivalent in most other locations.
As a math-head since the early1960s, I regard relying on "magic decoder rings" like PEMDAS/BODMAS as a rookie move. It is inexcusably sloppy compared to using nested parentheses.
@@flagmichaelAdding parentheses to add clarity is fine, but you can reach the point where too many of them become visual clutter and then they reduce clarity.
We don't need silly acronyms and prescriptive algorithms for the precise sequence in which every operation must be performed, but the fundamental convention of multiplication having higher precedence than addition makes mathematical notation more clear and more readable.
For example, nobody wants to have to write a quadratic as
a•x²+(b•x)+c
when we can just write
ax²+bx+c
No it's not and I proved it to many!!
Have a calculator that backs me up!!
@@lynnfrog2029It'll always get you the correct answer to anything that involves only the operations and notation that are covered by PEMDAS - that's the entire point of it.
But of course there is plenty of notation and operations that PEMDAS doesn't cover. Strictly surging, he's gone beyond the scope of PEMDAS in this video with the use of implied multiplication, although it doesn't make any difference.
B 6
The first one is B) 6
6
Bothered: NO ~
Is it F.O.I.L.?
12
2
I AM WRONG!...
I WAS AN ENGLISH GRAMMAR MAJOR AND NOW I KNOW WHY!
D if I am wrong I don't know how.
15 of course PMDAS
Answ 15 use BODIMAS
B
D=15
It's 6
Six
6 sl
b
I got the answer in just a few seconds but why took so long to explain and also confuse while explaining . BODMAS rule in Mathematics that I learnt when I was in Form 1😅😅😅
15…PEMDAS
The answer isb
Dear you tube math man, us here in th UK don't use P.E.M.D.O.S we use B.E.D.M.A.S. just thought I'd let you know.
Dear johnlakin5895, we in the USA use P.E.M.D.A.S. NOT “P.E.M.D.O.S”. Also, I thought you guys called is B.O.D.M.A.S. NOT “B.E.D.M.A.S.”.
Also, “Brackets” = “Parentheses” and “Exponents” = “Orders”. They’re the same thing, and we’ve heard about it in the US. Please Excuse My Dear Aunt Sally is just easier to remember.
@@andrewm6424 That points out one of the deficiencies of PEMDAS/BODMAS; it is a magic decoder ring that has no roots in mathematics, but is taught as a crutch. Ditch it and use nested parentheses to reduce the chance of misinterpreting the expression. The acronyms are just plain sloppy.
@@andrewm6424When teachers feel they need to give you a mnemonic for the mnemonic, that suggests there's something very wrong with the teaching strategy.
PEMDA S
15, in my head
If you don't know the answer don't go to college. It'd waste their time and your money.
I enjoy the refresher, but edit sir! We don’t need frowny 13:42 faces, etc. please be more concise. I want to keep watching these but so much wasted time!
Theanswer is 15
So why do I ever need to know this? Ridiculous.
b..the result is 6
You have to complete 6/2 before you do the subtraction.
15 is the correct answer.
whats really funny about math is unlike other subjects, math wants you to learn new math rules making more confusing, rather than just right the equation in the order they need to be figure with parentheses if any need to be done first, pemdas is silly, for instance in reading music, they notate the music as easy as possible so it can be played, i know math people will get all up in a huff, just curious, does pemdas have any value in the real world besides school math class?
Yes. It makes mathematical notation clearer and easier to read. Without the "multiplication before addition" rule, which is the bit that can seem counter-intuitive at first, mathematics would be more cluttered and less readable.
The convention has been around for a few centuries now. It evolved for a reason, and it wouldn't have stuck if it didn't make things better.
@@gavindeane3670
You are totally wrong, PEMDAS and BODMAS are crutches that try to explain mathematical principles, but with all crutches, you must know what each part means, and that “P” does not mean what is inside the parentheses, it means everything attached to the parentheses too:
For example: a(x + y)^b is a parenthetical statement which must be completely simplified before you can do any other operations, which is why people how use PEMDAS always get questions with implied operators wrong!
@@nfpnone8248 I don't know who told you that, but you need to stop listening to them because they don't know what they're talking about. Somebody has given you a really basic, fundamental misunderstanding of what parentheses mean and what they are for.
This is one of the problems with these stupid acronyms. People are taught something called "order of operations" but it has P for Parentheses in so people naturally think, like you have, that "Parentheses" must be an operation.
That's complete nonsense and nobody would ever think that if we ditched these stupid acronyms and just taught people what the symbols mean and what the precedence rules are.
There is no such thing as being "attached to" parentheses. You have completely misunderstood the issue with implied multiplication. If you want to understand it properly, look up the difference between PEMDAS and PEJMDAS. That will explain the issue you are talking about, without the need to completely redefine the meaning and purpose of parentheses.
@@gavindeane3670
I am a R&D Product and Process Development Engineering Manager, and I have had more math education than you can even imagine, and without parenthesis we could not separate problems of that complexity to solve them. Try again genius!
@@nfpnone8248 Did you look up the difference between PEMDAS and PEJMDAS?
I have explained how this stuff works to more people than you can possibly imagine. Your understanding of parentheses in mathematical notation is incorrect and the chances of you coming up with an argument I haven't seen before, and explained the flaw to dozens if not hundreds of people before, is pretty much zero.
15 🤓
Fifteen
You should have started your lecture with pemdas. Working out the wrong way just reinforced that. Not good.
I like your videos and learn from them. The problem I have with them all is that they're much longer than they need to be and you talk them to death. They could easily be cut down to a third of the time without loosing relevant valuable information.
My God it gets to the point of being painful. All the unnecessary little tangents you go on... You often repeat yourself. In a live teaching situation that's fine, it's normal but on a video that can be replayed where needed, if needed? No. And I say all this even though I listen to you at 2X.
I would be willing to bet that you will get more views if you cut them back to a reasonable length. My guess is that if you look at your stats you don't get many viewers that actually finish, or finish without skipping ahead through sections.
If you where teaching me I would have fallen asleep.
Write it algebraically to avoid confusion. There is a reason higher level math uses fractions and not the ÷ symbol. A novel is not written with 1st Grade sentence structure and vocabulary so math shouldn't be any different. Take 2*2÷7 and 2÷7*2 as the person writing it down may have made a mistake on what is in the denominator or numerator 4/7 versus 2*(2/7) or 2/(7*2) or (2/7)*2.
This would turn 14 minutes into 1 minute of explanation. My point is complex math should not use kindergarten arithmetic but use algebra. I beleive there is a reason that i have not seen a problem like this since 5th Grade.
This is an easy problem but if we are talking about something more complicated, there is high chance of error in writing it and solving it.
Meanwhile I got the answer in the first sentence of your comment! 😂
If the problem format had used a horizontal line instead of the division symbol (as you suggest) and had 2 as the denominator, I would have likely done this incorrectly. I may have subtracted the 6 first and then divided the simplified numerator by 2 yielding the wrong answer.
@@terry_willisBut in that case only the 6 would be above the horizontal line so you would have known that only the 6 is divided by the 2.
Using a horizontal line with numerator over denominator is the normal way to write division and the best way to write division, so in general that's how it should be written.
Not here though, because the entire point of this question is to teach the grammar of inline notation.
BOMDAS
The correct answer is 6
It's not 6, it's 15.
((5 + 4)2 - 6) / 2 would be 6 but that's a different question.
Bbbbbb
Yeah, thanks. Solved in less than 8 seconds. Smh
I don’t know where you learned math, but you are lost in the weeds!
The key to this problem is the minus sign that connects the multiplication and division, therefore simplifying will result in a very straight forward expressio:
(9 x 2) - (6/2)= 18 - 3 = 15
If it took you more steps than that, then you are on the wrong bus, and notice, I never used PEMDAS!
There was no brackets around 6/2 also your 6/3=2not 3
@@lynnfrog2029
First, I can put brackets or parentheses anywhere I want. And 6/2 = 3, I made a typo, but the answer is right, I’ll correct it so nobody else is confused!
But you knew to put the parens around 6/2 because of the Order of Operations.
@@petersearls4443
No, I just used the parentheses to separate the problem into its component parts, nothing to do with order of operations. Actually once you know what the operations mean, then you know everything is addition!
@@petersearls4443Order of Operations does two completely separate jobs and only one of them really matters. Consider an example like 1+2+3+4×5.
Firstly, Order of Operations gives you a set of precedence rules which tell you, in this example, that only the 4 is multiplied by the 5. We do not add 1+2+3+4 and multiply all that by the 5, because multiplication has higher precedence than addition. In other words, my example is equivalent to 1+2+3+(4×5) This is the critical bit.
Secondly, Order of Operations dictates a sequence in which you must actually PERFORM the operations. In my example, Order of Operations says you start with 4×5 = 20 then do 1+2+3+20 = 26. This is the unnecessarily rigid bit that doesn't matter at all. For example, there is nothing wrong with doing 1+2+3=6 to get 6+4×5, then doing 4×5=20, then finally 6+20=26.
I think the person you replied to is only concerned with the first bit.
Got 15 in seconds. This is elementary stuff, did in school when aged 7 to 8. And i am in my 80s.
To be accurate you said the answer in one second, more like 15 seconds! Ironic especially when espousing accuracy! Although I do like checking my answer with your accuracy. It is good to confirm my understanding of maths now that I am retired and older.
Science and mathematics in school does not seem to be recognised for it's intrinsic value. As a result a crazy WOKE culture has exploded that even politicians and governments have embraced.
Seems to me GAI (General Artificial Intelligance) could benefit society?
Surely you jest!
What a crock. There are lots of order of operation rules. You just propound one.
Not sure what other rules you have in mind but the only order of operations rule that matters here is that multiplicative operations have higher precedence than additive operations.
That rule is ubiquitous and fundamental to the way mathematics is written so there's no doubt what this notation means (unless you want to suggest that his use of ÷ instead of / for division introduces some uncertainty?)
@@gavindeane3670 When I was in college, there was a simple rule about mathematical expressions. Parenthesize everything exactly or face the wrath of what the compiler will do to you.
@stanleyreynolds7800 If there's a complier in play then you are dealing with a programming language.
For any programming language there is only one precedence hierarchy or order of operations that matters: the hierarchy set out in the definition of that language.
That definition is the absolute authority for what a particular expression means in that language. Outside of that language it is irrelevant - it has zero authority.
Here we are dealing with mathematical notation, not a programming language. What this expression might mean in any given programming language is irrelevant. The only thing that matters is what it means in the language of mathematical notation. And the grammar rules of mathematical notation tell us that this expression evaluates to 15.
@@gavindeane3670 Yeah, the computer rarely has the safety of infinite precision. And guess what? We live in the computer age.
Your channel does more harm than good. But hey how it’s all about clicks isn’t it.
Why did it take 13 minutes to explain this expression, for which it succinctly should have occurred in two minutes. This is poor teaching to be so incredibly inefficient
Welcome to TabletClass Math lol
Then don’t watch princess
@@jeffrobbins9931 What a remark of ignorance for which between you and me, you likely aren't the one who has run 25 marathons, climbed the highest mountains in the continental US, worked out every day for 3 years straight,
Next between you and me, you aren't the one who took all of the math courses required for a PhD at Duke and Michigan State, and who has an MA with a specialization in international finance.
Nor did you teach math at two universities and one of the top 10 private schools in the US (at the time), Cranbrook, for which the current base tuition is $40,000 per year.
With that.....I have corrected many math videos so people won't be instructed wrongfully, for which you were completely clueless.
My intent again is to not have math taught wrongfully, or in a confusing manner. So I made a comment in good faith, but you not simply sought to mock and insult.
The next time you want to make a demeaning remark to a man by calling him "princess".....do that to somebody who won't kick your ass athletically, or with math, and with life in general. Understood?
@randylazer2894. There are those of us who are not as smart as you and are so willing to learn,so……HUSH! Or, do not watch? Nobody is forcing you to watch. Just saying.
@@elladumaplin6922 You completely missed the point. That having taught math at two universities and one of the top 10 private secondary schools in the country (at the time), Cranbrook, where current tuition is $40,000 per year, I stand against teaching that is grossly inefficient.
That is the point, of not how smart I am per your words, but that for what could have been a 90 second video, which would have students understanding in roughly 1/8th of the time, this constituted a disservice.
When somebody provides legitimate criticism of inefficient teaching for the betterment of learning, don't ever tell them to hush, unless you support having people waste their time and potentially be confused on a very simple topic.
This is annoying. His explanation is ridiculous.
Такую ерунду разбираете слишком долго,это можно объяснить за минуту
I AM A BLACK AFRICAN CAPE VERDEAN 71 YR EXPERIENCED MAN....
D 15
D) 15
15