This is just the https://en.wikipedia.org/wiki/Grid_method_multiplication https://en.wikipedia.org/wiki/Grid_method_multiplication . Actually it is a more comp

This is just the https://en.wikipedia.org/wiki/Grid_method_multiplication https://en.wikipedia.org/wiki/Grid_method_multiplication . Actually it is a more complicated version of it. See here for an image showing how to multiply numbers with three digits using that method: https://math.stackexchange.com/questions/886177/where-does-the-visual-multiplication-technique-originate-from https://math.stackexchange.com/questions/886177/where-does-t...