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In order to tell whether a number is a multiple of 3:

  1. Start with a number N.
  2. Sum the digits of the number, and get M.
  3. If M is larger than 10, set N=M and return to stage 2.
  4. Otherwise, M is now smaller than 10. If M is 0,3,6 or 9, then N is a multiple of 3

A few examples:

924 => 15 => 6, therefore 924 is a multiple of 3.

974 => 20 => 2, therefore 974 is not a multiple of 3.

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Q: How do you tell if a number is a multiple of 3?
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