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Math Forum: Ask Dr. Math FAQ: Russian Peasant Multiplication
the Russian peasant algorithm. You don't need multiplication facts to use the Russian peasant algorithm; you only need to double numbers, cut them in half, and add them up. Here are the rules:
Write each number at the head of a column.
Double the number in the first column, and halve the number in the second column.
If the number in the second column is odd, divide it by two and drop the remainder.
If the number in the second column is even, cross out that entire row.
Keep doubling, halving, and crossing out until the number in the second column is 1.
Add up the remaining numbers in the first column. The total is the product of your original numbers.
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the Russian peasant algorithm. You don't need multiplication facts to use the Russian peasant algorithm; you only need to double numbers, cut them in half, and add them up. Here are the rules:
Write each number at the head of a column.
Double the number in the first column, and halve the number in the second column.
If the number in the second column is odd, divide it by two and drop the remainder.
If the number in the second column is even, cross out that entire row.
Keep doubling, halving, and crossing out until the number in the second column is 1.
Add up the remaining numbers in the first column. The total is the product of your original numbers.
http://ift.tt/1nugwST
http://ift.tt/1pYhBr0
from Public RSS-Feed of Jeffery yuan. Created with the PIXELMECHANICS 'GPlusRSS-Webtool' at http://gplusrss.com http://ift.tt/1nugytX
via LifeLong Community
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