Tests of Divisibility

A number is divisible by 5, if its ones digit is 0 or 5.

A number is divisible by 2, if its ones digit is 0, 2, 4, 6 or 8.

If a number is divisible by 10, then the number is also divisible by 2 and 5.

A number is divisible by 9, if the sum of its digits is divisible by 9.

A number is divisible by 3, if the sum of its digits is divisible by 3.

If a number is divisible by 9, then the number is also divisible by 3.

If a number is divisible by 3, then it may not necessarily be divisible by 9.

A number is divisible by 10, if its ones digit is 0.