How do japanese multiply??

Well a rather interesting video ! How japanese multiply, a rather simple mathematic computation,or not? :D Please enjoy :D!

Category:

Education

Tags:

• Numbers
• Multiplication
• Japanese
• Japan
• Math

[MrJaxyagi]

I'm Japanese.....somebody questioned how to work on 999x999. I will do it in my mind

999 x 1,000 - 999 = 998,001. I won't use such a complicated method. You just shuffle numbers to make easiest, fastest way to process.

[fabr13]

Ladies and gentlemen my brain has left the building

[BBbloodbrotherCCCX]

This is very interesting. I will show this to my math teacher.

[BBbloodbrotherCCCX]

@castleorange Yes they would. That is why I tried.

[KhanWT]

Lol definitely going to use this in maths and my teacher will look at it and go "WTF?"

[castleorange]

larger digits like 657 x 959 would get really tedious...

[catphish81]

@cinnymun7 the drawing basically creates a grid turned 45° in one direction. Each column of the grid gives the value for each place in the result. It seems like a column that goes above a value of 9 you carry the extra to the column to the left. It's exactly like traditional math (place values, decimal system)

[Jamnog]

yeah, India did it first how many times have I heard that? India invented taking the credit for things and the yanks perfected it lol (this is where I get the angry responses from nationalist types [btw I find nationalism offensive])

[DrSeussFreak]

this is pretty slick

[TrocaderoKillen]

This is extremely helpful and easy to learn! I've always hated mathematics, but this helped me alot!

[DJHempy]

Where was this when I was in high school!

[MrJaxyagi]

@dilaudid Well, most of time calculator is not available for me, and, I'm trying to use brain for trying not to senile (I'm 78). The method shown on the video I have never seen, or known in Japan. Maybe old Wasan(Japanese math) Before the calculator, Japanese used to use Soroban (abacus) extensively. To be good at it, we have learned to mult/div in mind (momerizing 2x2 to 9x9 at elementary school). I am inept using fingers on calcltr or soroban. So, using brain is easier.