How do you know if 3 goes into a number?

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2009-05-15 01:14:53

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Add up the digits of the number. If the sum is divisible by 3, then the number itself is divisible by 3. Ex: Is 781 divisible by 3? 7+8+1=16 16 is not divisible by 3 so neither is 781 Is 903 divisible by 3? 9+0+3= 12 12 is divisible by 3 so 903 is divisible by 3

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2009-05-15 01:14:53
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Q: How do you know if 3 goes into a number?
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