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Math Help - flipping number question..

  1. #1
    MHF Contributor
    Joined
    Nov 2008
    Posts
    1,401

    flipping number question..

    what is the math formula(algorithm) for flipping any number like:
    47->74
    1655 -> 5561

    12345->54321

    1190 -> 911
    ??
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  2. #2
    Member Mentia's Avatar
    Joined
    Dec 2008
    From
    Bellingham, WA
    Posts
    134
    add up the individual digits. multiply by 11. subtract the original #.

    for instance:

    x = 23

    2 + 3 = 5

    5* 11 = 55

    55 - 23 = 32
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  3. #3
    Junior Member
    Joined
    Dec 2008
    Posts
    52
    Quote Originally Posted by Mentia View Post
    add up the individual digits. multiply by 11. subtract the original #.

    for instance:

    x = 23

    2 + 3 = 5

    5* 11 = 55

    55 - 23 = 32
    Epic.
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