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_http://www2.sunysuffolk.edu/wrightj/MA22/Num/DivRule.htm_
(http://www2.sunysuffolk.edu/wrightj/MA22/Num/DivRule.htm)



3
If the sum of the digits is divisible by three, the number is also
4
If the last two digits are divisible by 4, the number is also
5
If the last digit is a 5 or a 0, the number is divisible by 5.
6
If the number is divisible by both 3 and 2, it is also divisible by 6.

There are lots more, and explanations.


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