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Topic: Marvelous Old Way of Multiplying
Replies: 3   Last Post: May 9, 2001 11:14 PM

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John Sullivan

Posts: 14
Registered: 12/6/04
Re: Marvelous old way of multiplying!
Posted: Jul 8, 1994 8:50 PM
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Now, wait. If you're actually going to count out 9*14 physical
pebbles, is it really any easier to do this than to just count
out 9 groups of 14, and then count them all?

This technique is of course the usual way used to raise a number
to a large power. If you want to find k^n, where n is several thousand
(and k is maybe 2 or 3), you simply square k repeatedly, and then
multiply together the k^2^j's which correspond to the 1s in the
binary expansion of n.

-John Sullivan






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