What is IT is shows when a number is divisible by 3. 1. 111 = 1 + 1 + 1 =3 and 3 is divisible by 3 2. 132 = 1 + 3 + 2 = 6 and 6 is divisible by 3 3. 45 = 4 + 5 = 9 and 9 is divisible by 3 s shows when a number is divisible by 9. 1. 36 = 3 + 6 = 9 and 9 is divisible by 9 2. 81 8 + 1 = 9 and 9 is divisible by 9