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Answered 2011-04-05 20:49:52

if the number is a 2 or more diget number, you add up all of the numbers in the number and when you have the sum, if the sum is divisible by 3 , the whole number is divisible by three

EX.

123=6, 6 is divisible by 3 so 123 is divisible by three

447=15 is divisible by 3 so 447 is divisible by 3

989=26 is *NOT* divisible by 3 so 989 is not divisible by three

this truly does work for every single number

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