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The Abacus - Part 8

Joe reviews the abacus method of multiplication, and demonstrates a shorthand method for calculating sales tax, that he used in an actual retail application in the early 1990s. Takashi Kojima’s abacus books: The Japanese Abacus: Its Use and Theory: https://amzn.to/2knoA28 Advanced Abacus - Theory and Practice: https://amzn.to/2lSfwmc

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