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A very quick way to know whether or not a number is divisible by is adding up the numbers within the number. And see if the new number is divisible by 3.

For instance, the number 527, add 5, 2, and 7 together. (5+2+7=14) The answer, 14, is not divisible by 3.

Another example would be the number 168. 1+6+8=15 The number 15 is divisible by 3, therefore the number 168 is divisible by 3.

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15y ago

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