Least common multiple exercise | Factors and multiples | Pre-Algebra | Khan Academy

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We're practicing finding the least common multiple in these example exercises. We'll teach you the prime factorization approach which is a pretty nifty way to find the lcm (least common multiple).
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Pre-Algebra on Khan Academy: No way, this isn't your run of the mill arithmetic. This is Pre-algebra. You're about to play with the professionals. Think of pre-algebra as a runway. You're the airplane and algebra is your sunny vacation destination. Without the runway you're not going anywhere. Seriously, the foundation for all higher mathematics is laid with many of the concepts that we will introduce to you here: negative numbers, absolute value, factors, multiples, decimals, and fractions to name a few. So buckle up and move your seat into the upright position. We're about to take off!
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[@matthewtheobald1231]

Once again Khan Academy proves that teachers in the classroom can't teach. Thank you for summarizing what took my class a month to teach me in 4 minutes

[@Joogly]

Did it really need a whole period for this? Just show us this video and school would be over in a few minutes

[@prod.Abagz.]

fr

[@bdulAhad0]

Maybe, that whole month laid a foundation, on which you were able to build what you found in this video, and felt satisfied.

[@bdulAhad0]

I had forgotten the phrase/sentence in other words the method which my teacher taught the class, and was trying to find that in these videos, And it was "Write the common multiples once, and all the non common multiples (the remaining stuff) and multiply them" or something along the lines. Well it was not something that only my teach came up with, Most of the teachers here probably say this. but guess it is not the same everywhere.

[@m.e.matute7544]

Thank you khan academy

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THIS IS AN ABSOLUTE GEM. THANK YOUUUUU!

[@mirandagibson7067]

I’m so happy I found these explanations! I began this year homeschooling my 6th grader who also has a learning disability that public school just wasn’t taking into an account. She didn’t even know her multiplication tables. It’s been a process. But Khan Academy videos have been the BEST Route. Thanks so much for these amazingly explained videos! Not just this one! All of them!
-Just a mom in NC

[@2uperCyber]

6th grader that doesn't know multiplication tables. DANG that kid is unique but not in a good way.

[@echothefreak9396]

Thank you! 💜 Coming from a 6th grader who hasn’t done common multiples in god knows how long and all of a sudden got it on a diagnostic

[@jingli8825]

I ready?

[@echothefreak9396]

@@jingli8825 Yep

[@anotherrandomasian]

Same situation as you lol

[@jasonx165]

Also, for people having issues with sound, it is most likely on your end because I am getting no sound issues.

[@dukie2134]

@Liah Wemhoff do u know that was 5 years ago right😂

[@dukie2134]

@Liah Wemhoff yes

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@Liah Wemhoff I'm only here bc exams starts tmr rip

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@Liah Wemhoff Gr9 and to top it off its maths first smh

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@Liah Wemhoff bruhh😢

[@corneliovelasco4691]

this is very good it help me how to find the LCM and GCF
10=10,20,30,40,50,60,70,80,90,100
5=5,10,15,20,25,30,35,40,45,50,
LCM=10
if you wanna find the LCM just use listing method

[@cherickaiqbal6474]

Cornelio Velasco lol

[@jessica11snow9]

Cornelio Velasco the listing method takes much longer as the numbers get bigger. That's why prime factorization is the proffered method

[@crystalstinson2365]

Cornelio Velasco thanks for the answer

[@lizdelgado3395]

That takes to long.

[@ceaugove]

Thank you so much i was just crying my eyes out

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OMGSH SAMEEEE

[@haystie]

0-0

[@issiyastezzy9549]

Thanks soo much you have helped me soo much in my studies and I am looking forward to learning more from you. KEEP IT UP 👍👍👍

[@airrisarenee4411]

This is so helpful. Thank you. I have a review packet for finals and I totally forgot how to do this

[@aidanbeers8963]

defineitly

[@katherinethecat4487]

Thank you I completely understood your lesson :)

[@keithscott2210]

So simple thanks!

[@maek864]

This gives me bad elementry school memory's

[@Psalm_47]

Mae K same

[@maggieagroff8033]

You learned this in elementary??

[@jiyzo]

@Zalaiah Bonnard lol i learned this in sixth but it was ez and im watching this bc school is starting monday for 8th and i forgot the EASIEST lesson (imo) from 6th grade somehow

[@Ihtsbarbiee123]

IKR

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*memories
Sorry if this was annoying

[@Ani.Music.]

Bro, how is his mouse writing SOOOOOOOO good?!

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He has an attachable pen

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yeah

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Thank you , it will help me more practicing my homework!nice afternoon.

[@cmtravelmamatio6718]

Wow very nicely explained thank you 👍

[@anotherrandomasian]

Thank you for helping me with my quiz! Although I couldn’t hear that well since my dad was snoring loudly in the living room haha.

[@yesiking520]

you explain so well

[@isabellalaing51]

Thank you so much for this! I am preparing for my junior year in highschool and want to relearn my algebra one stuff so I'll do good in algebra 2 this year!!

[@missnyokaxo967]

Thanks this helped but you can't just watch the video once to get the concept. Keep practicing everybody

[@JoseBarahonaes]

Thank you very much!

[@displayingsgt2040]

Thank you, helped me in studying for my finals.

[@Learn_Kashmiri]

The best way to explain to a kid, thank you for your videos, my kids are hooked to your material :)

[@rrrrriiiiiiinnnnitoshiii]

Thanks so much this helped me on my math exam !! This is why i love this channel❤️

[@dipansarma4596]

Thank you sir, the video was wonderful

[@allisonjett3966]

thank you kahn academy for my math

[@haystie]

Thanks to Khan, I KHOULD!

[@erratnicgaming8939]

Thank you so much I needed help for this

[@D0MM2]

Thank you man your a real one fr🙏🙏🙏

[@Ihtsbarbiee123]

This is my lesson on online class so i have to learn cause i dont understand what my teacher meant

[@syitix]

my teacher gave us this video to watch

[@royelbarsobia1936]

same

[@yami213]

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[@luvermei]

@@syitix same

[@memezorwhatever1323]

@@syitix lol same

[@StarPlatinum7912]

THIS IS SO MUCH BETTER THAN THE WAY THEY TEACH IT IN NEW YORK, I THANK THE KAHN ACADEMY GODS

[@InGeneralContent]

I know I am much above the average age group of people who is watching this video, but I am reviewing this information because I am studying number theory and a lot of these basic things are crucial. I notice that for students like me who have been studying mathematics for a long time, people like me (not always, but usually), tend to forget the principle of how to do things, and instead are more so motivated by muscle memory and pattern repetition. For example, if you were to ask me to find the greatest common divisor (gcd) of 18 and 21, I would just say 3, because I am so used to it by now. But if you were to ask me why, I couldn't give you an answer.
The same thing applies to other things in life too. For example, I can't be a grammar teacher because my English is too advanced to remember the basics. I just relearned two weeks ago when to use "a" or "an" before another word instead of just saying "Because I've done it for a long time" or "because it sounds right".

[@JesusMartinez-zu3xl]

I'm a mechanical engineering student "junior" and started to go over a engineering math textbook for the summer. I just decided to review from the basics from the book to refresh:)

[@sakthi2709]

Thank you that really helped me a lot

[@SzuTaChen]

Really helped with my math homework🎉

[@Neo1Gamer1]

Thank you!We pass it at school so I didnt understand anything then i wathched you video and I understood👍

[@julienne9072]

THANK YOU SO MICH

[@joe-to9iz]

THANK YOU

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Thank you so much

[@vluurz]

👍🏾 thank you

[@OnlineSchoolforAll]

It's a very simple and easy task.

[@nexius1879]

Thank you

[@Aurorixl5372]

Thank you I hated summer math this helped me a lot.

[@SteelyFl1nch]

tHIS MAKES IT A LOT EASY BECAUSE OF HIS ACCENT

[@royelbarsobia1936]

I like this lesson makes your brain smart

[@kellsliving3220]

need this for math uhh

[@NinjaBoy-qj9yd]

thx so much for teaching me this stratigy my old teacher did it in a way that took 13 trillion years

[@ExperimentZ21]

Awesome🎉

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Thankyouuu ❤️

[@davidflores8893]

"Here is a couple of reasons 1 its fun!" Lmao honestly

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ty

[@ally7824]

I was so confused and I had to hand this in tomorrow well in 12 minutes it will be tommorow

[@halaalkheliwi1212]

Thanks

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Bohat zaberxast hai

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Wow 3,000,000 subscribers!

[@mozulqurnanne5761]

thank you soooooooooooo much helped alot!

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Ok

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I'm here to learn English, and it's great

[@rashmisonalsingh9535]

Wow nice 👍

[@anushkabhandari9508]

Its just like putting them in order

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Love khan academy

[@ashley-fu9ys]

I'm actually very good at math, algebra, geometry, etc however helping my kid with this listing to this video makes me feel like madea(tyler perry) when he/she said I can't do no algero? I can't do no algiro.... it easy for me to just do it. But when explaining to her it's like a bunch of jibber jabber. Great job Mr. But I get how some things are easily understood depending on who is teaching it

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I love u Khan academy 1😀😀😀

[@itzzrain9232]

I'm in the 6th grade and rn I am just watching this and all the people who commented this are living in 2017 and 2015 :C The good years.........life is sad.

[@anushkabhandari9508]

I like these numbers

[@sagfire_]

thx

[@beanie_love]

lol my old math teacher would just make us watch these and leave

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You help me solve my Summutive test

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Great video helped me a lot!!!

[@woohwison3296]

What is small-factor hydrolysis? A small factor means divide a number into a number, which is a small number, but a small number is a small number. So let's take an example of small factor decomposition. If you break down 36 into small numbers, the result will be two times 18 times two times nine, or two times three times three.

[@vellosoraptor3725]

What program does khan academy use to do all the math problems

[@Allvn_edits]

i was crying my eyes out because i have a test on this today and i dont understand it at all :,)

[@Allvn_edits]

@Ava R I failed lol

[@shaplabakshi8818]

Nice

[@duke.2580]

Thankk youu

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U are the bigges brain

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wow why does this video not have 1mil likes

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Ohhhhhhhh I get it thank you very very much khan academy

[@Ghastify]

thanks bro. i forgot how

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Yeah go ahead make it harder on everyone

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what app do you use for recording the video?

[@islandsunshine1]

What is the name of the the software you to draw on that chalkboard thing?

[@KuroNekoIX]

thank you so much

[@poonamrani8451]

Oldmugk

[@fanzhang3300]

did you stop to think about all the souls of poor kids getting crushed by this video. SOS [screw our semesters]

[@kurozikoasu1887]

I'm watching this for middle school thx

[@zhimingren8572]

Comment if you are learning this in 2020

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I do GCA and this is like connected to that school program😂

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Khan acaadummy rules again🥳🥳🥳🥳🥳🥳🎉🎉🎉🥳🥳🎉🎉🎉🥳🥳🎉🎉🎉🎉🎉🎉🤪

[@jeffreyliu4146]

i hate how in school even when you know it the teacher makes you do it 1 billion times why cant we just do it 1 time and take the test?

[@educatorayush]

sir, what is the LCM of a negative integer and a positive integer? For Ex: - What is the LCM of -10 and 15?

[@vrexeh8030]

Ayush Kumar -30

[@yodatwinkie]

If you do the first method your a serial killer 😂

[@fireender6236]

thx it help me now i can surely get a A+ Lol

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Old days :D Its 2020

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[@superstar_]

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[@singingpanda7775]

What website do you go to for doing math? ( not Khan academy. ) Like with the colors and stuff.

[@boomerboxer3574]

Photoshop

[@kellykms8398]

What do you mean by enough prime factors to cover both of the numbers?

[@samiraansari3662]

how tf he write so perfect?

[@solaristatv4402]

what app or website you use for teaching with the colors and other stufff

[@howdyrider3933]

Khan academy rules 😘🤩🤩🤩🤩🤩🤩🤩🤩🤩🤩🤩🤩🤩🤩🤩🤩😅

[@ur.fav_stannn]

Teacher better then my teacher😅

[@thattallguy9053]

Thank you so much i was confused but after i got it your a true hero

[@hooitinglim3732]

sir,what is the website you do in this video ?I think i can get more pratice to improve my math.

[@dakoolpotato]

khan academy ;-;

[@_-.Sweetly_salty.-_]

What website or app is that giving you the Question?🤔btw I love you're video🤗

[@eliteibo5741]

Say 🤡

[@ar0m2ispro79]

I might be late but the website is in the description.

[@anushkabhandari9508]

4 times three is twelve

[@anushkabhandari9508]

Four times three is twelve

[@hectorecheverri6758]

How does your numbers are beautiful in computer mine are so bad XD as i in math