Thread: Graphical multiplication
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Old 01-19-2012, 08:35 PM   #4
mmblz
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Default Re: Graphical multiplication
Mostly algebra...

21 * 13
(20 + 1) * (10 + 3)
20 * 10 + 20 * 3 + 1 * 10 + 1 * 3
2*1 * 100 + (2*3 + 1*1) * 10 + 1*3 * 1
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