Least Common Multiple Trick LCM

[@EwigesEis]

Hey man, I watched ALL of your videos in order to prepare for a very demanding set of exams. All of these tricks are very helpful, thank you so much for sharing it to everybody! Keep up the good work!

[@ethanliu1618]

AD: wHaT!!!! sTiLl sEaRcHiNg yOuTuBe fOr mAtH hElP?! tRy sOmEtHiNg nEw aNd jOiN sTuDy pUg! Me: Go away. I got tecmath.

[@kenziephan]

AHHAHA SAMEE

[@joeanderson2024]

I tried studying. It’s worse then khan academy and cost $20 more a month. Don’t do it.

[@urgefann77]

Took me a bit to catch on, but this is much much easier than the decomposing method in my book. Thank you so much!

[@kylelam884]

then how do u do it with 4 different numbers? Do you do 2 numbers using this and another 2 numbers doing this and the result of both numbers you do it together? But still how do you do it with 3-4 numbers

[@glennfelpel9785]

Love your way of thinking! Thank you for all the effort

[@jadabouelzalofi612]

OMG YOU ARE A GENIUS. YOU ARE THE NEXT EINSTEIN. GOODNESS. HAVE A BLESSED LIFE DEAR SIR.

[@shreeshvijay6071]

You just earned yourself a subscriber

[@theriptide_4260]

This is such a good method, so much easier thank you.

[@MysticNugget84]

This helped me tremendously! Thank you!

[@Amberussianbeauty]

I’m shook right now. This helped soooo much

[@Tsskyx]

I figured out that for the last step, you don't have to divide one of the original numbers by the result, like 5202/17, you can simply look at the notes to the right and work out how many times does the 17 go into 5202 step by step. Like, the last red note is 2, and the note above it says 1r17, so 2*1+(17/17) is 3. The next note says 6r34, so 3*6+(34/17) is 20. It's also worth noting that these results correspond to the numbers written in the left column, so 20 corresponds to 340, 3 corresponds to 51, etc. The next note says 7r51, so 20*7+(51/17) is 143. The last note says 2r340, so 143*2+(340/17) is 306. If you can't do 340/17 quickly, then just remember that the previous results correspond to the left column. (20 corresponds to 340, so 340/17 must be 20) Anyways, 306 is the result, because we've reached the top. This seems complicated, but just try it for yourself, it's really not that difficult.

[@jollyfire7963]

WOOOW MY TEACHERS STRATEGIE IS SOO MUCH WORSE THANKS SO MUCH TECMATH

[@andoidski]

much relaxing to watch in 0.75x playback speed ya know?

[@pokemonhub9863]

thanks you make it so easy to understand have you have uploaded a tutorial to find the lcm gcm of 3 numbers or more? would be helpful

[@marshwiggleme]

Hey Techmath, I always get the right answer with fractions initially, then mess up the simplification as i don't know where to start. Best, easiest way to do this?? Is prime factorization a good way? How do you do this? I could not find a video.

[@noobkingxd3975]

if you can't do it to the LCM or HCF like 13 and 6 what to you right as an answer please help

[@Bigmooka]

you teach me better tan my maths professor.Thank you.

[@lancejaredcayabyab5284]

amazing tecmath technic

[@siddheshpatankar4791]

But how will it work for multiple numbers? Say I want to find for 72, 108 and 2100

[@jasonjose4736]

This method works for two numbers, but what if we need to find LCM of three or more numbers? Please help me as I find this method (2 numbers) really helpful.

[@MaximilianBerkmann]

You probably already found the answer to this question since you posted that 3 months ago. But a way to do that would be to get the common LCMs of a with b and a with c such that. Given three numbers a, b and c; you end up with {x | x∈LCM(a, b) & x∈LCM(a, c)} which is the set that will give you the LCM of a, b and c.

[@RobinHood-hk5dk]

Brilliant - Thanks mate

[@ushalokesh4278]

Nice... Thanks for the video

[@kieronjones6313]

just finished my maths exams today, feel like i smashed it,thanks @techmamath

[@siddheshpatankar4791]

You are great! Thanx a lot man!

[@dhrithimahadevan7754]

this is so Amazing!

[@CaliBear2009]

Thx man! This really works!

[@chantal0861]

love it Thanks so much

[@sayerunali9343]

Wow! This is cool

[@SebastianGarcia-qo2vq]

You are gods gift to earth.

[@smart_idiot8204]

It works really well but takes a long time awesome video and mostly they won't work

[@Starman.2957]

I love this channel

[@jsrryy]

This looks easy And Fun =)

[@vincentrigby5611]

This method works for two numbers, but what if we need to find LCM of three or more numbers? Can you help in this

[@MaximilianBerkmann]

You probably already found the answer to this question since you posted that 3 months ago. But a way to do that would be to get the common LCMs of a with b and a with c such that. Given three numbers a, b and c; you end up with {x | x∈LCM(a, b) & x∈LCM(a, c)} which is the set that will give you the LCM of a, b and c.

[@danial9864]

Remember: that the remainder doesn't come from the complete division process, but rather from the first time you do it that's why such as in 9:45, the remainder is 130-from 1040/455 → 1040 - 910 //455*2// = 130 so it's 2 with a remainder 130, and it isn't 2.*285714*. . ., which is what you get for the final remainder after solving it.

[@haik8234]

How about 3 different numbers?

[@rohansastry9524]

HikingLifewithHaik u can still do it

[@Noah-le2os]

Use the ladder method for LCM or GCF.

[@user43643]

Luv it

[@cheemsebol69]

i learned more here than from my teacher

[@exotic_ace8750]

Does this same method work when trying to find the LCM of 3 numbers?

[@veronicarios5042]

Hello, I wanted to ask a question about the problem using the numbers 45 and 20. When we found the GCF was 5. You then said we had to divide 45 and 20 by 5. Yet you only dividing 45 and 5. You got 9 and then multiplied by 20 and got that as an answer. I'm a little lost on why we didn't divide 20 by 5. I am trying to learn this correctly but still feel confused.

[@luiro9551]

Hi there! Just like the first example with 72 and 60, once we get the GCF; in this case the gcf is 5 for 45 and 20, we must divide any of the 2 numbers with the gcf then multiply it with the remaining number of the two. He did 45 divided by 5 and got 9 and so 9 x 20 = 180. If you divided 20 by 5 first, then multiply the quotient with 45 you will get the same answer of 180. Im not too good with explaining math stuff but I hope you got it by now :3

[@gachasmol1758]

Hello tecmath, I have an easiest trick to find the LCM OK? For an example: 3 and 9 (Sometimes, When three numbers, you may use this formula (a × b × c) So let's move on. Do this 3 × 9 = 27 So the answer is 27. Now for three numbers: 3 and 4 and 5 Do this 3 × 4 is 12 × 5 = 60 is the LCM.

[@haseebgaming1762]

Can you tell me a method that works for 3 or 4 numbers???

[@its_anshu_39]

You tell 90 and write 80. Your 80 sounds like 90. Ha ha ha ha. Nice tricks these tricks are awesome.

[@thegamingkid_yttgkteam7350]

Would you just divide? The remainder is the answer. This is just the Euclidean Algorithm

[@goodmorningmumbai9653]

I took example of 20 and 12 I am not getting the result please help sir.

[@Summer_201off]

Hair I don't now what is least common multiple can you teach me pls

[@thebiggestcraft6555]

hey i think i found an error for finding the GCF. i have the question with the 2 numbers 12 and 8. I do what you told 12, 8 8 goes into 12 1 times with a remainder of 4 and now I bring down the 8 8 / 4 = 2 no remainder. The GCF is actually 4 so is this a flaw? Pls help because I have a test tmr.

[@nyone4040]

that's the first step and you did it correctly, but now like he said in the video step #2 you need to see how many times that GCF goes into one of those two numbers, and then multiply by the other whole number; for example 4 goes into 12 three times (12/4 = 3) now take that number and multiply it by the other whole number (3*8 = 24) and that's your LCM. As mentioned in the video you can do it with either of your two numbers because it will give the same result (8/4 = 2 and 2*12 = 24)

[@liv8535]

you sound like my maths teacher hahah

[@deoviongoodson7072]

can u please do a video on ratios

[@bryden5243]

Thanks

[@shreepatil4832]

9:15 Did he say '896' and write '886'

[@zainhyder4432]

Oof

[@DepFromDiscord]

no...

[@jonxchannel]

how about three numbers?

[@FredoCorleone]

The most nastiest was correct for me! :)

[@E.94772]

Ty

[@BrownTown1897]

i hope you get over your cold soon

[@metrogman2409]

I love it.

[@audominous1219]

ty

[@lavendano4921]

Awesome! ! !

[@sophiegamer5986]

PLZ techmath make a lowest common factor video

[@SebSharma]

sophie Gamer why?

[@johnbave6391]

So clever

[@radfordpilgrim4393]

isnt it lowest common multiple?? not least

[@wajdyalnaserallah334]

right but it doesn't matter too much for u

[@RePaperBag]

He does math. Not litarature.

[@tecmath]

+Radford Pilgrim Thanks for the comment. Either lowest common multiple or least common multiple are used.

[@wajdyalnaserallah334]

+tecmath Thank you

[@abigailjacksonasare1010]

tecmath i have been searching for your factorising video in algebra and I can't find, can you please let me know the title. Thank you, you are amazing! :)

[@rizzwan-42069]

When i did lcm of 1040 and 455 i did it completely different and got the same answer lol

[@GauravGupta-jn4jq]

Sir u did wrong calculation in the question 1040 and 455 LCM. Please recheck the working. U divided the smaller number by the GCF at the end. Instead u had to divide the bigger number by the GCF

[@tecmath]

+Gaurav Gupta Thanks for the comment. Once you find the the GCM you can divide this into either the bigger our smaller number, then multiply by the other number. The result is the same.

[@GauravGupta-jn4jq]

+tecmath ohhh. My bad. I did not know that. Thank u.

[@GauravGupta-jn4jq]

tecmath sir in last question I tried solving 5202 / 17. Although I did not know it was perfectly divisible, I somehow managed to solve using your long division method. Where the remainder was also divisible by 17. I added the quotient of the remainder to the units value of the final quotient derived and got the answer. I hope I did correct.

[@kaibalyasahu7343]

Sir, plz add subtitle.

[@Szaize]

Kaibalya Sahu google translate

[@princesscadence1096]

G'day!

[@mariav9gt49]

mmmmmmm sir you should probably make one with the answers just sayin..

[@johnryder1713]

Another customer satisfied, again....

[@cassidy7651]

3:56

[@crubvygamer8195]

He said 190 but he wrote 180 lol 4:13

[@kylelam884]

for 8 it for some reason says 9 but it is 8

[@kniyi2onroblox28]

who knows what e=mc^2 means

[@andywright8803]

I do

[@BenignGamer]

Relativity students. Some of the nitpickier ones would also like to point out that due to mass-energy equivalence, for all objects not at rest the equation has to be changed to E = [(p^2c^2) + m^2c^4]^1/2, where P is the object's momentum.

[@andywright8803]

+Benign Gamer Oh, and I just thought it meant Einstein didn't need to do any more gigs again

[@pasemek2501]

+Andy Wright What Benign wrote is Einstein's equation and the one everyone knows is estimated where momentum is so small that it makes next to no difference in the result.

[@andywright8803]

+Pasemek Yeah, I know all that, I used to work in nuclear physics. I was just trying to make a flippant comment, like when Don McLean was asked what Amercan Pie meant, and he said "It means I'll never have to work again"

[@Summer_201off]

Wrong message

[@Nikhil-vy2lt]

There's way more faster process for LCM than this.

[@mohammedjawahri5726]

Nikhil K which is ?,I've been looking for a while because prime factorization is too unefficient / slow

[@nonomanko5865]

Why does 72 divided by 60= 1.12 while my calculator shoes 1.2

[@ramunese4419]

72/60=1.2

[@kingkronic4927]

First comment

[@shigwig9751]

First

[@fellascusine4714]

Dis is epic but slightly confusing

[@tissorrr]

will this method work for 3 separate numbers? how would you go about it? say something like the LCM of 2, 5, and 7.

[@luiro9551]

I have made up an equation based on the one in this video, tho it isnt completely reliable. When finding the lcm of 3 numbers , let's take 2 7 5 as an example, you multiply the greatest number and the second to the greatest number. So, 7 x 5 = 35. Then we leave 35 and 2 beside each other and check, is 35 divisible by 2? The answer is no. So we multiply them, 35 x 2 = 70. The lcm of 7 2 and 5 is 70! As i said, this doesnt apply to all questions, since i rushed in finding the answer to your question over a timespan of 10 minutes. There are many rules that are applied in this method, it just so happens that i got lazy in trying to clarify all of it. This prolly didnt help but i hope it gave you at least an idea...ok bye 😭