Pseudorandom Bits

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    Scruff on Multiplication with lines
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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!

This entry was posted on March 19, 2008 at 5:28 pm and is filed under Diversions, Mathematics. . You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

3 Responses to “Multiplication with lines”

  1. acook Says:
    April 24, 2008 at 11:27 am

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

    Mike’s wife :-)

  2. Mike Says:
    April 24, 2008 at 8:24 pm

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

  3. Scruff Says:
    June 18, 2008 at 8:17 pm

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

    cheers, Scruff.

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