Multiplying with Lines - Neatorama

(Video Link)

Allegedly, this video shows a way to multiply large numbers by marking lines and counting their intersections. It seems to work -- at least on these examples. It's probably a good technique if you lack sufficient fingers and toes.

-via Nag on the Lake

Vi Hart (of Doodling with Math) explains this pretty well...
http://youtu.be/a-e8fzqv3CE

Brilliant!

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e.g.

http://michellemalkin.com/2007/11/28/fuzzy-math-a-nationwide-epidemic/

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Don't show that to Conservatives. They'll complain you're not doing it the "right" way.

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Seems to work well enough, we did a pretty tough one and it worked.

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You can also see a demonstration of how it works at: http://demonstrations.wolfram.com/MultiplyingWithLines/

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Alex Bellows does that and many other similarly intriguing things. Something to do with Vedic maths... You can see that and several others at http://zomobo.net/alexbellos

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