MCAT Math Vid 4 - Scientific Notation for Addition, Subtraction, Multiplication and Division
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- เผยแพร่เมื่อ 1 มิ.ย. 2014
- Leah4sci.com/MCATMath presents: MCAT Math Without A Calculator Video 4 - Scientific Notation for Addition, Subtraction, Multiplication, and Division
📺Watch Next: MCAT Math Without a Calculator Simplified with Shortcuts • MCAT Math Without a Ca...
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This video is part 4 in my MCAT Math Without a Calculator video series. This video will show you how to approach MCAT style questions requiring addition, subtraction, multiplication and division for numbers written in scientific notation.
↪ Links & Resources Mentioned In This Video ↩
▸MCAT Math Series + Cheat Sheet Leah4sci.com/MCATmath
▸MCAT Chemistry Series + Cheat Sheets Leah4sci.com/MCATchemistry
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Leah, you are helping me feel confident about my math abilities! I didn't realize how many of these rules I already seem to know and how I have already solved problems like these before in my pre-med classes. That tells me I am just psyching myself on PS practice, and that I don't have any reason to. You make it seem like this type of problem solving is actually much easier than what I've had to do for classes, because it is! Thank you so much!
You're very welcome, I'm so glad to hear how much my resources helped you!
Thank you so much for your videos. I was struggling with time in the PS because of long calculations. You are an awesome teacher. Best wishes.
Valerie Martinez awesome! glad I can help. When are you testing?
Honestly...these videos will help not just for MCAT but also for NEET which is similar to MCAT but its an entrance exam for students who are planning to go into Med school in India (which I am planning to do). As an American teenager, we are so used to using calculators like TI-84 and what not. I wish our teachers taught this in our school and practised with it. Thank you so much Leah!!!!!!! you are literally the BEST!
You're very welcome!
Neat!
love the way you simply explain things. and it doesn't hurt that your voice is so soothing! haha
Oh thank you LOL!
You're such a good teacher. You make this stuff look easy.
Thanks so much! That's my goal, to make this just a bit less difficult than others make it out to be. Glad it worked
I wish I had found this earlier. I'm taking the MCAT tomorrow and feel okay, but the way you present all this material is brilliant. It really attenuates the terror that the MCAT's complexity tries to induce. Thank you so much I'll definitely be using these principles to weed out traps and clearly incorrect answers!:)
Michal Twardowski glad it helped. How was your exam?
+Leah4sciMCAT I hate to say this because it probably means I did horribly, but it really felt okay. :/ Now the 30 day wait..
are you in medschool already ?
OMG thank you so much my math had gotten so rusty but you really are a life saver !!!! thank you so much
You're welcome! :)
Quick and to the point, easily accessible you should teach at my University.
I'm glad you enjoy it, but isn't teaching on TH-cam more accessible than teaching at your University?
Leah you are the BEST!.... I used your videos to overcome Ochem 1 and 2.. Now I'm using your videos again to study for the MCAT... Thanks so much!
that's awesome! When are you taking your MCAT?
Aug 27th, 2014
Did you apply in 2014 to Med schools ?
these videos are great!!! thank you!!
everberry51 Thank you. When are you taking your MCAT?
I was going through your videos for review of basic mathematics principles, and ended up learning a new trick, never really thought about doing the whole 5/5 + 2/5 deal, always kinda just estimated - 7.5/5 = 1.5, so it's a little bit under 1.5 is what I'd do, but your trick's better
I'm glad you like it. Your's works too. Just do whatever is quicker/easier for you.
just loved these tricks i was worried about my poor maths ! thank u
You're very welcome, glad to help!
Bless you. I struggle with math so much and decided after I graduated with a music degree that I wanted to pursue a career in medicine.
Glad to know the video helped! You're welcome and I wish you all the best!
Please explain the last part 7/5= 5/5+2/5
@@vareemalik4221 Both have the same common denominator. 5+2 is 7 so you get 5/5 +2/5 is 7/5. 5/5 is equal to 1 so it's 1 + the decimal from 2/5 as your answer.
It’s very helpfull thanks
You are the best teacher
You're very welcome! Thanks for your kind words!
for myself: 4:04 multiplying or dividing numbers with exponents (of the form y*10^(x))
multiply or divide the number as normal, and for the exponent, add for multiplication and subtract for division.
Taking notes like this is not only a smart idea for your own prep, it will help others, too! Happy studying!
You may have just saved my score!!! thank you
+Addie A glad to help!
@Addie A how did it go?
thank you; this is so helpful
You're so welcome!
Hi Leah!! Thank you for the videos!! I really needed this because math on the MCAT has been a struggle of mine. I have one question, how do you know when the answer is in the correct scientific notation? For instance, on your last division example how did you know that 0.5 x 10 ^3 at 5:29 was not in the correct scientific notation? I was also confused with that for the adding example at 3:19
Proper scientific notation requires that one significant digit be placed IN FRONT of the decimal point. That's why you see me shifting the decimal point in both of these examples and changing the power accordingly.
I'd love to help you improve your MCAT Math! For help with questions like this and more, I recommend joining the MCAT Study Hall. For details, visit join.mcatstudyhall.com/ or contact me through my website leah4sci.com/contact/
@@Leah4sciMCAT Thank you so much!! This makes a lot of sense and I'll check out your MCAT Study Hall!
You are my hero!
Glad I could help :)
If I could ever meet you, I want you to know that I would give you the BIGGEST WARMEST HUG EVER AND TAKE YOU OUT DINNER. In all seriousness, thank you for these amazing videos. Your ability to take seemingly complicated processes and transform them into something anyone can understand is beyond me. Thank you, thank you a million times,
Medina Sareini Thank you! Let me know when you're in NY. I like hugs ;)
damn girl, youre killing it in these videos
Thank you!
Your introduction is so satisfying to watch in the beginning of each video haha.
Thanks!
thanks you help me lot
You're very welcome!
How do you do the trick when you have 3/5? since there is nothing that adds up to 3 that equals 5. In your example you did 7/5=5/5+2/5
3/5 can be multiplied by 2/2 giving you 6/10 or 0.6
How were you able to get 5/5 + 2/5. Did the denominator remain the same and you split the numerator? Also I was confused after this part. If you could assist in helping me with how you found 1.4.
At which part of the video please? (Timestamp)
Hi Leah, I presume the OP means at 6:28, where 7/5 = 5/5 + 2/5 (I know how you “got it” but I am nowhere good at explaining, whereas you are sensational!)
Hey Leah I got 1.4 x 10^-5. I saw the fraction 7/5. I knew 1/5 is .2 so I multiplied .2 by 7 to get .14 since I made .14 larger to 1.4 I have to decrease my base to 10^-5. Can you help me see what I got wrong please :(
Your mistake was really small! Multiplying 0.2 by 7 gives us 1.4 (not 0.14). Knowing that, we can keep our base at 10^-4 for a final answer of 1.4 x 10^-4. Happy studying!
Hi, may you please tell me how you would go about doing this?
1. 8000/.004
2. (.20)/(.24) = (x)/(6.0)
basically i dont undertsand 1.2/.24
Please help!! thank you
I'm sorry, but I don't offer tutoring over social media . For help with questions like this and more, I recommend joining the MCAT Study Hall. For more details visit join.mcatstudyhall.com/ or contact me through my website leah4sci.com/contact/
At 3:10 of the video you said you multiplied 10^-4 to get 10^-3 how is that so? How did you come up with 10^-3? I'm still confused can you help explain please?
Happy to help. I said that 10^-4 times 10 gives us 10^-3. In this particular example, I was trying to convert the answer into proper scientific notation, which required me to move the decimal place back one place to the left. Doing so meant dividing 56 by 10 to get 5.6 while simultaneously multiplying 10^-4 by 10 to get 10^-3. Think of it this way: (10^-4)(10^1) = 10^-3
@@Leah4sciMCAT omg thank you so much it makes sense now. Your a big help!
Question: why wasn't 0.5 x 10^3 an appropriate answer?
for which point in the video?
Actually... I failed MCAT😢 and now I'll give my MCAT again in august 2016
+zoya haroon how does one fail the MCAT? I assume you got a score lower than your target?
+Leah4sciMCAT study on self finance was possible...but I decided to repeat
I don't like the way you explained this topic at all, you made it unnecessarily confusing.
I'm sorry you didn't like the video. Thanks for watching anyways!