Math Operation Methods Teacher Ins.

This is how in Japan many students are told to do multiplication
http://9gag.com/gag/a2N5P4Z

What other forms of math techniques were you shown?

I was taught the rational method:

 12    ■2    1■    ■2    1■ 
x13   x■3   x■3   x1■   x1■  
‾‾‾ = ‾‾‾ = ‾‾‾ = ‾‾‾ = ‾‾‾ = ↴ 
        6   36     36    36 
                   2■   12■  
  12
 x13
 ‾‾‾ = ↴
  36     36     36
+12■ = +12■ = +12■ = ↴
‾‾‾‾   ‾‾‾‾   ‾‾‾‾
   6     66    166   166

That 166, should be a 156. Dyslexia kicked in, and incited a multiplication instead of an addition for the (+ 2 3).

PS the_shame.txt

I found it tese were already discovered long ago... I am so late into the game:
http://nrich.maths.org/5612
http://threesixty360.wordpress.com/25-ways-to-multiply/
https://en.wikipedia.org/wiki/Multiplication_algorithm
http://www.cimt.plymouth.ac.uk/projects/mepres/book7/bk7i6/bk7_6i2.htm

The math thread was:
https://boards.4chan.org/sci/res/5963120

[b][u]MP