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math trick

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Uploaded by on Feb 3, 2007

math trick

Category:

Howto & Style

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License:

Standard YouTube License

  • likes, 15 dislikes

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  • You dont need to draw it all the time if you understood what he does...for example 187*199 is way too big to draw it....

    He's just doing it that way (Example 187 * 199)

    1 * 1 = 1

    1* 9 + 8 * 1 = 17

    1 * 9 + 8 * 9 + 7*1 = 88

    8 * 9 + 7 * 9 = 135

    7 * 9 = 63

    Now you get the results and do it the way he does, from back to beginning...If there are more than one number, the first one jumps one up...You ad the 6 of the 63 to the 135 so its 141 and you go on like that...

    Result: 37213

  • really cool :)

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All Comments (105)

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  • My head... maybe the abacus is easier for me.

  • @mohdmubasshir Read my comment for multiplying those big numbers ;)

  • @chickenguy999 No, I was just bored :D

  • @XxElNinioxX nerd

  • thats the mayan math !!

  • What should I do when there is a 0 in the middle of the number?

    Example:109 x 102.

  • cool

    

  • I tried doing this on my homework .......I got yelled at for drawing on my paper

    Thanks :P

  • nice

  • @JackPierreAziz lol, guess it doesnt work for that one, pretty cool though

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