Multiplication and Division of Fractions

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If we know how to add and subtract fractions, we should know how to multiply and divide them too, right? Don't worry, it's actually even easier than adding and subtracting them, because when we multiply two fractions, they don't have to have the same denominator, like when we add them. And dividing by a fraction is the same as multiplying by its reciprocal. It's all in here, take a look!
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Опубликовано:

27 июл 2024

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Комментарии : 80

@ProfessorDaveExplains 5 лет назад

Oh no!!! At @ I say "one times anything is one", which is a horrendous misspeak on my part! I should have said "anything times one is itself", as here, three times one remains three. Sorry!

@topiado2073 3 года назад

Sir lots of respect to you 🙏

@30.yusufhabibi4 3 года назад

That's ok grandpa chill.

@birdsayshello 3 года назад

the math lords will smite you

@RadoHudran 2 года назад

Now there's an editor for youtube creators, You should be able to edit that. Thx for the content

@comoyun 2 года назад

Okay

@amchedli 6 лет назад

Hey Prof. Dave, should the last problem be simplified to 7/4, as opposed to staying at 21/12? thanks .

@ProfessorDaveExplains 6 лет назад

ah shoot! yeah, i suppose so. thanks for catching that!

@alexmirzabdullaev395 2 года назад

@@ProfessorDaveExplains you are a magnificent teacher. I wish I had a teacher like at school

@professorelixir3351 2 месяца назад

I was going to ask the same doubt, thanks for that!

@jjsage8903 Месяц назад

So you simplify so matter what right?

@stevemitchell9520 3 года назад

I've got no real reason for being here, but I watched anyway & you've reminded me ( I'm 55) how easy dividing fractions is. I think I'll keep watching a few more, great work 👍

@antoinettemarsh7221 4 года назад

Thank you for helping me to understand this topic in math

@sorxussenpai7474 5 лет назад

Thanks passed my exam bcuz of you.

@anthonystark6215 Год назад

Thank you, Professor!

@pkgirl856 4 года назад

Thanks for teaching me how to do this but it was easy on it's own so thank you for your help I learnt mine from google online

@ReimskyToussaint 4 года назад

This made me better. Thanks

@salmank1978 6 месяцев назад

Hello professor dave i just found your channel and i m addicted now...

@user-ib7mm2nc5n 5 лет назад

It helps me doing mathematics good thanks you

@haroldborja1474 4 года назад

Thank you

@dontstealmydiamondsv3156 3 года назад

Thanks!

@reprepulse2718 4 года назад

Good thanks

@gulabmishra1362 7 лет назад

Thanks sir ji

@g.r.4372 10 дней назад

20/165 on my way there. Thank you Prof. Dave. This series should be preserved for future generations.

@purplemario4008 8 месяцев назад

that intro never gets old 👌🥰

@gulabmishra1362 7 лет назад

Ok thanks sir ji

@MouthTutorials 2 года назад

ur one of the only teachers ik that opens the chat

@asjsk8286 Год назад

gracias por el video, aprendo mates y tambien mejoro mi inglés

@yuinurahilyon5711 3 года назад

Professor Dave, I’ve got a question, if it’s multiplying and dividing by fractions. Then shouldn’t the answer for no.1 problem be (2/9)(11/4) since it’s a fraction? That 11 which is the dividend is greater than the divisor which is a fraction. Then you could simplify it by (22/32)=(11/16) instead of the solution (8/99)? I apologize if my question is a bit silly. But I have a tiny trouble understanding why the answer is (8/99).

@Alex-02 3 года назад

The two fractions are MULTIPLIED by each other, you should only switch like that if they are divided by each other. If it looked like this: (2/9)/(11/4) you would be correct, but the actual problem looks like this: (2/9)x(11/4)

@user-lr6xc4jm1c 3 года назад

Here's a tip, if you see two parentheses like this: (7)(9)=63 or like this: (7)9=63, the operation is always multiplication. The x sign of multiplication is rarely used as you move on to advance math because it looks like the variable x which causes confusion.

@davidzubiria3783 2 года назад

Why the last one it´s not 7/4

@ramesht.s6710 3 года назад

Thank u sir from indian

@MiltosPol-qn3zh 7 лет назад

When you make videos for geometry, can you explain lobatchevskys and Riemanns geometry???

@ProfessorDaveExplains 7 лет назад

that's pretty complicated stuff! when we get to geometry it will just be normal euclidian geometry that you learn in high school, and then back to more algebra, then trigonometry, then calculus. but after calculus it will become a grab bag of advanced topics so i will definitely try to hit all that stuff then!

@MiltosPol-qn3zh 7 лет назад

Professor Dave Explains Just a mention to these kind of geometries and their differences between euclidean.( I go to high school so I couldn't understand many details)

@gulabmishra1362 7 лет назад

Sir ji why florin highly reactivate elements in periodic table

@ProfessorDaveExplains 7 лет назад

it has a super high electron affinity!

@gulabmishra1362 7 лет назад

Sir explain carbon atom outer shall 4 electron and it's great property bond formation why sir with animation

@ProfessorDaveExplains 7 лет назад

first, this is a math clip, buddy! direct off topic questions/comments to my email. second, i already did a clip all about carbon, it's in my "science for common folk" playlist.

@satyateja5167 7 лет назад

please make a video on basics of statistics.

@elyanhriz5068 Год назад

thank you for all that but can you please explain how 3/10 / 5/4 =3/8 ?????? in should have to be 3/10*4/5=12/50 is that right ?

@loopedspaces4389 10 месяцев назад

(3/10)(5/4) would be 15/40 which you can further simplify by dividing 15 and 40 by their gcf which is 5 so, 15•5= 3 and 40•5 is 8 hence 3/8

@mindaugasanuzis9802 9 месяцев назад

That's 3/10 * 5/4, so answer is 15/40 -> 3/8. I made the same mistake like you (didn't notice there is no division symbol).

@physicsphuntime 7 лет назад

You said 1 times anything is one around 2:15

@ProfessorDaveExplains 7 лет назад

ah shoot! what an egregious misspeak. i think i will just add a note in the description. thanks for catching that!

@geneva4034 Год назад

I'm shocked you didn't teach the butterfly method. Great video though, and i always prefer a technical explination, we all learn differently though.

@passiongreen155 4 года назад

Thank you you have helped me and I liked the video

@MW_TNT 4 года назад

shut up u are nothing

@ananyaprakash8591 4 года назад

@@MW_TNT that is so rude she is just trying to show her gratitude

@MW_TNT 4 года назад

Ananya Prakash I was mocking her chill

@mamadwali4278 3 дня назад

❤❤

@richdevil5816 2 месяца назад

👏!!

@antoinettemarsh7221 4 года назад

what is (54/94+67/57)

@ProfessorDaveExplains 4 года назад

i have a separate tutorial on adding and subtracting fractions check that one out!

@LikeKoby Месяц назад

15/24 = 5/8 right?

@moi-tripa 10 дней назад

right

@chourouk-gr9qg 24 дня назад

Im still into the intro

@Stoirelius 4 года назад

The first and third exercises are wrong, the answers should be 11/18 and 6/25

@bosniangamer5509 3 года назад

bro r u trolling?

@Stoirelius 3 года назад

@@bosniangamer5509 It’s been a year from this comment, and I have absolutely NO IDEA why I wrote that. I have no recollection of it either. That’s embarrassing.

@Stoirelius 3 года назад

@@bosniangamer5509 I get it now. I though he was dividing the 2 fractions, so I inverted the second fraction. But he was just multiplying them. Sorry.

@bosniangamer5509 3 года назад

@@Stoirelius it's alright man, mistakes happen from all of us

@alexsalgado52 2 года назад

@@Stoirelius Lol thank you for pointing that out! i was like i'm doing it right then saw your comment and scrolled up and noticed there was no division sign lol

@hg77777 7 лет назад

(3/10) (5/4) = 3/8 ??? isn't it 15/40 ?? excuse my ignorance if I'm wrong...

@kconger_ 7 лет назад

Yes, but you can simplify 15/40 further by dividing both the numerator and the denominator by 5. 15/5 is 3, and 40/5 is 8, so the fraction becomes 3/8.

@hg77777 7 лет назад

Kim Conger thank you, I noticed it afterwards lol 😂

@kconger_ 7 лет назад

You're welcome, Vanessa - I am also prone to silly mistakes!