Multiplication 5: 2-digit times a 2-digit number

[cuteypie1cute]

i didnt understand my homework or work at school so my teacher gave me this website and it really helped me alot so thanks mr.

[jtrauta]

this was awsome you lost me a bit but i understand the logic

[TYM4U2STFU]

someone please tell me how you would work out 23 times 42 but in ur head

[Yoko30030]

THANK YOU SOOOO MUCH

and mrPinhead you suck crap

[passwordcamelia]

gooood



[mrPinhead444]

you suck

[Lonewolfindarkness]

Need. Help on home work.  Ratio of 17 and 6

[eASTcOASTiVORY]

I wasn't very apt at math back in school and now have to go back and learn everything. Just want to say that you explained this very clearly for me, and was very easy to understand. Thank you :)

[laysampson1231c]

This video went viral on Mexico City

[kykiskeexgold]

Man I wish I was taught this earlier.

[morethemoregamer]

if you dint understand the first part he said i'll explain it he said what is 36x23 first you add 3x6=18 put the 8 down carry the one to the 3 3x3 is 9 + 1 is 10 so put the 0 down then the number cant go anywhere so the 0 invited him to the party so the answer is 108 these are simple things im homeschooled its much better being homeschooled try it i learned how to multiply big numbers and divion say hmm 1734 divided by 344 equals 5.040697674418605 by regrouping it helps learn it

[morethemoregamer]

@itsAzureBlue

if 19 x 3 is 57 there is no zero to skip when you said jus skip the zeros there is no zero in the number 57 19x3 is 57 but you just had ya answer so you dont need a zero to answer that but if the problem is a higher number such as hmmm something that equals 57 and the problem is a high number you add zeros like you said 5,700 if its a lower number it would be 57 such as 19 x 3 so you need to rethink and plz do reply to this comment if i sad something wrong

[MrTimee5]

I have just no idea what just happened in math.

[morippy1]

is this third grade because i'm in fith I must of forgot XD

[bcchang22]

Go to khan academy.com to learn a lot more.

(:

[bcchang22]

this teaches a lot!! :)

[flower323luvsyou]

Thanks you helped my little sister learn how to multiply!! She is SOOOO happy now lol

[ItsAzureBlue]

this works great, except....How would you multiply a number like 190x30? would you 0x0 0x9 0x1, then put 3 zeros down? I'm confused :/

[rawrrisque]

@ItsAzureBlue Yes, because anything multiplied by 0=0, it may look odd but I think that what you're trying to say may be right. so... 190x 30 everything multiplied by 0 is 0 so for all 3 digits write 3 zeros.

[bichobachas]

@ItsAzureBlue actually thats really easy... just skip the 0's... so you have 19 x 3... that is like.... hhm 57... now just ad the two 0's you skipped... and you hace 5,700... :D thats the way I learned

good luck

[Sukiqa]

What I really loved about this one was, he explained WHY. I've always had a nagging feeling in my backhead when my teacher simply said "we'll just put a zero down here." (Me: Ok.. why? Teacher: "We'll just do it. Me: -_-'').. lol ;)

[300PIVOTMASTER]

is this fourth or third grade because my brain is blowing up

[wafflecraft]

Thank you! This really helped my 3rd grade brother who for some reason couldn't understand my explanations :P

[H0tkebab]

Lol, I get it now. ^-^

Thanks, now I can pass my college/polytechnic paper. =P

[eldezeable]

What program are U using? The colors look pretty kewl!

[estela76100]

i dont care

[lnr08f]

I use vedic math. Can multiply and number by any number in just seconds in my head. Look it up. If you're teaching your kid math teach him both ways and he'll be a math god

[GenericCoder]

Thank you khan.I always learn something from your tutorials.

[cucho803]

multiplying two digit numbers by two digit number is a little confusing



[MegaBuckfever]

cool markers holmes

[Tadeleh]

Believe it or not I'm in my senior year of Electrical Engineering in University of Texas. N i came back here n watched this video....I don't know wt 2 conclude here.

[missbassoon1992]

7:16 mind blown, idk why but I find that so cool, I never made that connection =D maybe it's because I am a math nerd. THANK YOU KHAN!!!

[EvanWells1]

I remember throughout school very little reminders about the logic behind things, which for someone who doesn't grasp it easily, is absolutely crucial. To list the distributive property might be part and parcel, even if secondary, to explaining that the 2 is actually a 20, instead of just saying: " we add a zero ," or even "we do so because it's in the tens place." I believe maths teaching goes too much in stages, myopically, whereas things like this would have helped me to conceptualize!

[coil311]

I actually forgot how to do this since primary school. Thanks for the refresher.

[tottenham14]

Thank you so much struggled with this since primary school.

[blazinfire14]

thank you so much after all these years you just forget some of the basic math thank you so much youve earned my subscription

[j4n3w0ng]

i get it whatever # you use x a 1 digit # u can use the same method!

[WhosAlex]

NOOO WAAYYYY!?!?!