Multiplying with Lines

(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

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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
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