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If the digits of the number you're dividing by 3 add up to a multiple of 3, the whole number is divisible by 3 and there will be no remainder. If they don't add up to a multiple of 3, there will be a remainder.

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2016-04-11 23:00:20
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Algebra

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Q: How can you tell before you divide by 3 if there will be a remainder?
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