Russian Multiplication

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This Demonstration shows how to do Russian multiplication.

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To multiply two numbers and , write them at the top of two columns. In the column, divide by 2, dropping any fractions, and repeat, ending with 1. In the column, double the same number of times. In the third column, copy from the column whenever the column is odd. The product is the sum of the third column.

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Contributed by: Izidor Hafner (November 2016)
Open content licensed under CC BY-NC-SA


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