The number is divisible by 5 if the unit's digit of a number is 5 or 0.

If the unit's digit of a number is 0, then the number is divisible by 10

If the last two digits if a number are zero, the number is divisible by 4

The number is divisible by 3 if the sum of the digits of a number is divisible by 3.

If the last three digits if a number are zero, the number is divisible by 8

If the sum of the digits of a number is divisible by 9, then the number is divisible by 9

The number is divisible by 11 if the sum of the even-numbered digits and the sum of odd-numbered digits in a number are equal.

12+4=16, 16+8 = 24, 24+16=40, 40+32=72

Number is divisible by 2 if unit's digit is a multiple of 2.