fucking japanese. Mind blown, and it's so simple. Where the 10's meet you get 100's where the 10's and 1's meet you get 10's And where the 1's meet you get 1's.
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fucking japanese

Mind ******* blown, and it's so ******* simple.
Where the 10's meet you get 100's
where the 10's and 1's meet you get 10's
And where the 1's meet you get 1's

Tags: dat math
Home Japanese kids learn to multiply
in primary wheel
...
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Views: 26012
Favorited: 92
Submitted: 09/26/2013
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Comments(75):

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User avatar #2 - sinery (09/26/2013) [+] (2 replies)
I don't understand it; thus it is inferior.
13*10=130 --> 130+13+13=156
Desc too long.
#19 - anon (09/27/2013) [+] (8 replies)
try 77 x 77. this **** do not work
User avatar #23 to #19 - uraharajunior (09/27/2013) [-]
I just did and it worked fine, i'd post a pic but im level 0 so i can't.

77 x 77

10's hits 10's 49 times
10's and 1's hit 98 times
1's and 1's hit 49 times

49 98 49 gives 5929

Which is the correct answer according to my calculator so yeah..
it works
User avatar #12 - fuckinfuckinfuck (09/27/2013) [+] (1 reply)
Or you can just do 13*10 + 13*2...
#38 - vanoreo (09/27/2013) [+] (1 reply)
I'm using a trackpad don't make fun of me
3x2, 2x1 =
drop zero to next level
1x13, put before zero
add products
#30 - anotheroneonearth (09/27/2013) [+] (1 reply)
I'm Japanese and thought it was totally normal, what's so surprising?   
also this is how we confess love
I'm Japanese and thought it was totally normal, what's so surprising?
also this is how we confess love
#9 - heyhihey (09/27/2013) [+] (1 reply)
We were just taught to memorize all of the numbers..... **** me
User avatar #1 - wardd (09/26/2013) [+] (3 replies)
Mathematical proof

AB * CD
= (A*10 + B) * (C*10 + D)
= A*C + 10*A*D + 10*B*C + 10*10*A*C
= A*C + 10*(A*D + B*C) + 100*A*C

I'm a physics student
User avatar #63 - mereu (09/27/2013) [+] (2 replies)
I've been trying to understand this for the past 30 minutes and it still makes my head dizzy. I still find it easier the conventional way. Or maybe i'm just stupid
0
#54 - soupkittenagain has deleted their comment [+] (6 replies)
User avatar #57 to #54 - GoukakyoNoJutsu (09/27/2013) [-]
800 + 220 + 12 = 1032
User avatar #37 - xgreenmaidenx (09/27/2013) [+] (10 replies)
Our math teacher learned us this some weeks ago ( and im from Sweden)
Im still using it and it's amazing!
User avatar #40 to #37 - aabbccddeeffgghhii (09/27/2013) [-]
I almost corrected your sentence in a douchebag way... Then i saw the Swedish part... You get of this time...
#66 - fourtitwo (09/27/2013) [-]
The abacus system is really amazing for speedy calculations. If you have the time, I suggest searching for Mental Calculation Record, and watch the world record.
The abacus is a tool, that allows a person to calculate a number without ever doing any math. Calculation becomes a mechanical feat, and the japanese students are then taught to visualize the abacus in their heads. They simply remember the position of the beads, and once all numbers have been factored in, they read what it says
Naturally this has it's shortcomings. As calculation isn't mathematical, once the numbers or operations start to get more abstract, they tend to fall behind students, who've done calculation in the traditional way; if they can't apply the abacus, they don't have as much training.

Ofc, they're japanese so they naturally get training in abstract calculating ;-)
#27 - purestwater (09/27/2013) [-]
Yeah... I always just did math in my head. **** showing your work and **** the system!
#26 - hyeroshi (09/27/2013) [-]
A friend of mine showed me box multiplication the other day and it works really well for me. I wish they would have taught us box or lattice method growing up instead of long multiplication. It feels a lot more comfortable for me to do it with the box method.
User avatar #25 - bounod (09/27/2013) [-]
How I count 13*12
= 10*12+3*12=120+36=156

Something more complex like 75*48 would be
=75*50-75*2=5*750-150=2*750+2*750+750-150=1500+1500+600=3600
User avatar #13 - bestbeforedeath (09/27/2013) [+] (6 replies)
Just tried it with 15 x 36... as a random sum

apparently that equals 3 26 30 or rather 32,630....

i think that's a bit off....
User avatar #16 to #14 - bestbeforedeath (09/27/2013) [-]
hmmm i guess that makes sense, except the answer is 540....
#7 - djequalizee (09/27/2013) [+] (1 reply)
Our school was taught this.

I never used it though, Traditional masterrace
#67 - savestate (09/27/2013) [+] (1 reply)
User avatar #65 - Kainim (09/27/2013) [-]
this is actually the Mayan method
User avatar #39 - bitchplzzz (09/27/2013) [-]
now i feel stupid
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