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Math Help - Checking if a no is divisble by 24 or large nos.

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    Checking if a no is divisble by 24 or large nos.

    While preparing for standardized tests i need a quick method to see if one no is divisible by another however these quick tests are only available to check for divisibility by 2,3,4,5,6,7,8,9,10 or 11. How do i check if a no is divisible by a larger no say 23 ?
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    Re: Checking if a no is divisble by 24 or large nos.

    23's a little difficult; I don't know any easy way other than simply, divide by 23. For other numbers, say, 24, just make sure it's divisible by both 8 and 3.

    You're from AZ, are you referring to the AIMS test? I hate that test...
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    Re: Checking if a no is divisble by 24 or large nos.

    Naa am planning for the GRE
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    Re: Checking if a no is divisble by 24 or large nos.

    Ah okay.
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    Re: Checking if a no is divisble by 24 or large nos.

    Quote Originally Posted by MikeNoob View Post
    While preparing for standardized tests i need a quick method to see if one no is divisible by another however these quick tests are only available to check for divisibility by 2,3,4,5,6,7,8,9,10 or 11. How do i check if a no is divisible by a larger no say 23 ?
    Wikipedia has divisibility rules for larger numbers, but it probably isn't worth memorizing more than a few common ones.

    For 23, add seven times the units digit to the other digits and see if you get a number divisible by 23.
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