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Thread: Magic Numbers

  1. 22nd February 2007, 09:01 AM #1
    Black Ned
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    Default Magic Numbers

    Number 9

    9 x 2 = 18 --------------1 + 8 = 9
    9 x 3 = 27 --------------2 + 7 = 9
    9 x 4 = 36 --------------3 + 6 = 9
    9 x 5 = 45 --------------4 + 5 = 9
    9 x 6 = 54 --------------5 + 4 = 9
    9 x 7 = 63 --------------6 + 3 = 9
    9 x 8 = 72 --------------7 + 2 = 9
    9 x 9 = 81 --------------8 + 1 = 9
    9 x 10 = 90 -------------9 + 0 = 9
    9 x 11 = 99 -------------9 + 9 = 18 --------------1 + 8 = 9
    9 x 12 = 108 ------------1 + 0 + 8 = 9
    9 x 13 = 117 ------------1 + 1 + 7 = 9
    9 x 14 = 126 ------------1 + 2 + 6 = 9
    9 x 15 = 135 ------------1 + 3 + 5 = 9

    ETC ETC

    Will this ever end?

    Just a useless piece of information to bore the crap out of the whingers that don't see the funny and interesting things in life.
    Last edited by Black Ned; 22nd February 2007 at 09:48 AM. Reason: Spacing is confusing
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  2. 22nd February 2007, 09:05 AM #2
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    You have made my day.
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  3. 22nd February 2007, 09:42 AM #3
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    This uses the same principle as division by 3. If the sum of the digits in a number is divisible by 3 then so is the original number.
    eg 93 /3= 31
    9 +3 = 12 also divisible by 3
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  4. 22nd February 2007, 09:57 AM #4
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    nerd alert!!
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  5. 22nd February 2007, 02:54 PM #5
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    ...and if the sum of the odd digits in a number is the same as the sum of the even digits, the number is divisible by eleven.

    ...and if you multiply 12345679 by any multiple of 9 up to 81, the product is a 9 digit long string of the other factor. e.g 12345679 x 18 (9x2) = 222222222

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  6. 22nd February 2007, 03:03 PM #6
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    I repeat: nerd alert!!!
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  7. 22nd February 2007, 03:15 PM #7
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    Quote Originally Posted by silentC View Post
    I repeat: nerd alert!!!
    Be alert: Australia needs lerts.
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  8. 22nd February 2007, 04:10 PM #8
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    Quote Originally Posted by Linden Hardy View Post
    Number 9

    9 x 2 = 18 --------------1 + 8 = 9
    9 x 3 = 27 --------------2 + 7 = 9
    9 x 4 = 36 --------------3 + 6 = 9
    9 x 5 = 45 --------------4 + 5 = 9
    9 x 6 = 54 --------------5 + 4 = 9
    9 x 7 = 63 --------------6 + 3 = 9
    9 x 8 = 72 --------------7 + 2 = 9
    9 x 9 = 81 --------------8 + 1 = 9
    9 x 10 = 90 -------------9 + 0 = 9
    9 x 11 = 99 -------------9 + 9 = 18 --------------1 + 8 = 9
    9 x 12 = 108 ------------1 + 0 + 8 = 9
    9 x 13 = 117 ------------1 + 1 + 7 = 9
    9 x 14 = 126 ------------1 + 2 + 6 = 9
    9 x 15 = 135 ------------1 + 3 + 5 = 9

    ETC ETC

    Will this ever end?

    Just a useless piece of information to bore the crap out of the whingers that don't see the funny and interesting things in life.

    What a useless piece of information, it's boring the crap out of me. Can't you submit something funny or interesting? (if the hat fits....)
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  9. 22nd February 2007, 08:15 PM #9
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    Be alert: Australia needs lerts.
    I'm annoyed. Do we need Noyds too?
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  10. 22nd February 2007, 08:27 PM #10
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    ....and did you know that the butter fat content of the south pacific sea cow is 47% higher than that of human milk....
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  11. 22nd February 2007, 08:39 PM #11
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    It's also true that 71% of statistics are made up on the spot.

    Tex
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  12. 22nd February 2007, 08:44 PM #12
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    Save this for tomorrow boys
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  13. 22nd February 2007, 08:51 PM #13
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    We need Cliffs imput in this
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  14. 23rd February 2007, 12:03 AM #14
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    Not quite as useless as y'all seem to think. This is the basis of a venerable old method of checking computations called "casting out nines." See for example http://en.wikipedia.org/wiki/Casting_out_nines

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