Any number that has 9 as a factor also has 3 as a factor.Why is this?

Question

• Any number that has 9 as a factor also has 3 as a facto.Why is this??

Answer 1

Because 9 = 3² -- this means you can successfully divide 3 into a number, and then again into the quotient, without getting a (nonzero) remainder.

 

Remember, a number is divisible by 3 if the sum of all its digits equals a multiple of 3.