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if one of its factors are a 3 or after dividing a number by 3, their are no remainders

There is also another trick: add all of the digits of the number together. The original number is divisible by 3 if and only if the sum of the digits is divisible by 3.

For example:

321 is divisible by 3 because 3+2+1=6 and 6 is divisible by 3.

322 is not divisible by 3 because 3+2+2=7 and 7 is not divisible by 3.

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โˆ™ 2010-01-15 01:13:26
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Q: How do you know if a number is divisible is by 3?
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