Drawing lines to multiply

Holy crap!! In the deep recesses of my brain, I remember learning how to do this from a teacher I had in elementary school! I haven’t used it since (I think mainly because I never quite understood where to draw those arches across the lines) but after watching this video the trick seems to make a bit more sense to me. [via]

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One Response to Drawing lines to multiply

  1. bob says:

    although it looks amazing but it is too slow to be practical.

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