New Multiplication Technique
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Showing all 1 comments.
ranlex
Although it may look amazing, it's simply a pictorial representation of 'foiling'.
For example:
21 * 13
=(20+1)*(10+3)
=(20*10)+(1*10+20*3)+(3*1)
= 200 + 70 + 3
=273
It works the same for 123*321, but, to save time, I'm not going to write it out.