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graphical multiplying

Name: Anonymous 2006-11-26 8:20

Name: Anonymous 2006-11-26 11:50

21 * 13 =
((2*10) + 1) * ((1 * 10) + 3) =
(2*10*1*10) + (2*10*3) + (1*1*10) + (1*3) =
200 + 60 + 10 + 3 =
273

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