1- all numbers are divisible by 1
2- even numbers
3- when you add the digits up, sum of the digits are divisible by 3
4-divisible by 2 twice
5- ending digit has to be 5 or 0
6- divisible by 3 and 2
8- divisible by 2 thrice
9- add all the digits up, sum of the digits are divisible by 9
10- digit has to end with 0
*there is no divisibility rule for 7
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