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Multiplication with lines

Posted by Mike on March 19, 2008

Another topic my wife showed me. Multiplication by drawing lines. As she pointed out, this would get cumbersome (or worse) with numbers of several digits, but it’s interesting anyway.

Here’s a video.

Here’s a written example.

Why does this work? Nobody knows! OK, somebody does. This site also suggests how to do this multiplication when some of the digits are zero. How do you draw a “missing” line? Dots easy!

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3 Responses to “Multiplication with lines”

  1. acook said

    Actually, it was Dave G. who pointed out the cumbersome nature of the method. But it’s still fun!

    Mike’s wife 🙂

  2. Mike said

    Thanks for the info. It’s nice to know someone is still reading this blog! More posts someday soon.

  3. Scruff said

    Somehow i missed the point. Probably lost in translation 🙂 Anyway … nice blog to visit.

    cheers, Scruff.

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