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What are some tricks to figure math problems quickly?

Math Help


I recently watched a show with a math genius on it. He claimed to be able to teach children ways to figure large math problems with no pen or paper. Does anyone know any of these types of tricks?

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This entry was posted on Saturday, May 2nd, 2009 at 4:53 am and is filed under 1283. 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 “What are some tricks to figure math problems quickly?”

  1. RSS Feed Reader Says:
    May 3rd, 2009 at 1:22 pm

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    I saw a tv special about that one time. This kid no older than 13, could multiply, divide, add, and subtract HUGE numbers in less than 10 seconds. The way they taught him to do this (I think it was in China?) was by training him to use the abacus for many years. He got so good at it, that he could visualize moving the parts of the abacus in his mind so he didn’t need it anymore. It was really cool! Sorry I don’t have any useful tips for you though….

  2. Says:
    May 6th, 2009 at 3:46 pm

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    I have a book, “Math Magic” by Scott Flansburg, if you’re looking for how to do large number crunching by hand.

    But from my standpoint as a former math contest participant and having graduated from college in math, I found that sort of stuff totally useless. Use your calculator. ;)

  3. Hide Folders Says:
    May 9th, 2009 at 6:37 pm

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    I know this one:
    How to cube any number that ends with 5

    e.g. 15×15
    1×2(the following number)=2
    5×5=25
    therefore 15×15=225

    another e.g.
    25×25
    2×3=6
    5×5=25
    therefore 25×25=625

    another e.g.
    85×85
    8×9=72
    5×5=25
    therefore 85×85=7225

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