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Alternative Multiplication Method

Name: Anonymous 2010-05-03 4:47

http://upload.wikimedia.org/wikipedia/en/0/05/Gelosia_multiplication_45_256.png

I dont get it.

Name: Anonymous 2010-05-05 21:51

alright, I've figured out the diagonal addition to get the first sums, but what is the secondary numbers on the outside? :/
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