Can 345 be divisible by 9?

Answer 1

No, it is not divisible by 9.

To check if a number is divisible by 9 add all the digits together and if this sum is divisible by 9, then so is the original number.

As the check can be applied to the sum, keep adding the digits together until a single digit remains. If this digit is 9, then the original number is divisible by 9 (otherwise it gives the remainder when the original number is divided by 9).

for 345: 3 + 4 +5 = 12

for 12: 1 + 2 = 3

which is not 9, so 345 is not divisible by 9. (The remainder when 345 is divided by 9 is 3.)