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If the sum of the digits of a given number is divisible by three, the number is divisible by three.

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Q: What is a quick way to determine if 3 is a factor of a number?
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Is three a factor of 47?

No, 3 is not a factor of 47. A quick way to know that is to add the digits in the number. If they add up to a number that is divisible by 3, the number itself is divisible by 3. If they don't, the number is not divisible by 3.


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