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Well, to find out if any number is divisible by 3, you add up the number's factors. If the number you come up with is divisible by 3, then the entire number is divisible by 3.

For example:

138= 1+3+8= 12

12 is divisible by 3.

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โˆ™ 2009-09-16 21:43:12
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Q: Why is 138 divisible by 3?
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