## A Conversation for Russian Peasant Multiplication

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The Apprentice Started conversation Jun 15, 2007

Excellent - great article. It even worked (once I'd mastered the ability to double and half numbers without making simple errors!).

The Apprentice

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CRich70 Posted Jun 16, 2007

It is neat how you can do little math tricks to simplify calculation.

Take 16 *8 for example. 16* 8 = 128

If you double the 16 to 32 and halve the 8 to 4 you still get 128, and if you double the 32 to 64 while reducing the 4 to a 2 then you get 64 *2 = 128. You just reduce the one to its lowest denominator (if I remember my math correctly) while raising the other to its largest # by an equal amount. Numbers like 60 *4 are easy as well. 6 * 4 = 24 then you just add back the 0 so 60 *4 =240.

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Icy North Posted Feb 17, 2009

Hi TRiG

It's something every schoolchild should be taught, in my opinion. Not that it's a practical method (because it isn't), but it's a simple introduction to number theory.

Icy

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