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Divisibility test

  1. Jan 31, 2005 #1
    Hello

    I would like to know how to determine whether a number is divisible by 11 or not... say 209.

    I know the divisibility rules from 2 to 10... but how about 11?
     
  2. jcsd
  3. Jan 31, 2005 #2
  4. Jan 31, 2005 #3

    HallsofIvy

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    Staff Emeritus
    Science Advisor

    Add and subtract the digits alternately. The result is divisible by 11, if and only if the original number is.
     
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