How to Multiply

Japanese multiplication maths trick. How to multiply two numbers together using a simple visual lines diagram technique. Perfect to help anyone struggling with arithmetic.

Larger numbers can also be calculated using the same principle if you follow the same rules.

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[celiabalfour]

I'm a Maths teacher, and I almost feel guilty that I didn't already know about this method. I can't wait to teach it to my students.
Nice one. Thank you 😊

[devonsmith]

The dislikes are the teachers staying "this isn't the method I taught you

[annaowen]

Me: *multiplies like this*
Math teacher: Why are you drawing in class?
Me: 😒 But I’m not.

[idboxbiz]

*To teach the Japanese method to children, it is better to use different colors for units, tens, hundreds. It makes the task much more visual and easy to understand!*

[Amazing-Everything]

this tip actually made me pass math class! thank you so much!

[DavisCoD]

IMPOSSIBLE!!! this trick it realy works! Why didn't we learn this at school?!
(or at least, i didn't learn that trick at school.)

[marlongarcia]

wait a minute, I can actually have fun multiplying and still make it easier, teachers need to start teaching this

[o_]

For those wondering about numbers with 0s in the middle, just draw the 0s as dotted lines without counting any intersections with the dotted line. Just as the normal 0, the dotted line 0 is just there to tell apart the decimal bases.

[Terminator]

I'm stunned. Shocked. Utterly floored. Never heard of this before. When I was in school, the ONLY accepted system was to somehow memorize the entire times tables of 100 abstract numbers, which always had certain numbers (like the 7s and 8s) that were orders of magnitude more difficult to remember than any others... and the system totally broke when going above 11x11. Even if you had the times table tattooed on the back of your hand, you were helpless without a calculator if you were working outside the table. Worst of all, as soon as you graduate, you no longer use any of it and rapidly forget everything above multiplying by 2.

But seeing this... I have to ask: HOW does it work? What is the logic behind this system?

Also, what if there's a zero in the numbers? I'm obviously not asking about multiplying by zero; I mean a number like 10, 20, 100, etc.

[joelsorri]

You know dave, i got 9+ or B+ from math test because i remembered this :p

[emilygiammatteo]

Why am I so angered that I am literally shaking Bc I could’ve used this SO MUCH in elementary and middle school.

[teris.]

I know I'm late, but I've been looking at ways to help my daughter who is struggling with her learning disability. Not saying this is a cure all, but honestly, this might be the best thing I've seen to help her. Thanks!

[mikehollins]

I am a visual artist an this has opened a whole new look on math, Thanks!

[JeremyWS]

I wish I knew this when I was younger. It would've helped a lot. I thought it was gonna be more complicated, but it was a surprisingly simple trick. I am glad I now know how to do this. Thank you.

[Chris-npzl]

But how does it work when there's a zero in the number?

[wayneandrews]

This trick is absolutely amazing! It has helped me out SO much. No need to re-organise where the calculators are every day in class or any need for calculators at all! Thanks a million! Ur the best!

[fermata]

You've explained this better than anyone else I've seen. Well done! 

[jayy-tg]

This was absolutely amazing! I just wanted to know to multiply three digit numbers, but couldn't find anything. The I stumbled upon this and it was very helpful😊. Thanks for making the vid!😎

[ernestonwona]

Love this guy! He's straight forward, clear and doesn't take much time to teach. I understood this in less than 4 mins.

[bryanFDNY]

Anyone else calculated it faster out of there head ?