Divisibility Rules

An integer is divisible by:

2 if the integer ends in 0,2, 4, 6, 8.

5 if the integer ends in 0 or 5

10 if it ends in 0.

All even numbers end in 0,2,4,6,8,10 and are divisible by 2.

An integer is divisible by 3 if the sum

of its digits is divisible by 3.

An integer is divisible by 9 if the sum

of its digits is divisible by 9.

Example: 924 is divisible by 3

because

9+2+4 = 15.  15 is divisible by 3.

549 is divisible by 9 because 5+4+9 =

18.  18 is divisible by 9.