Write 54+63 as the product of the gcf of 54 and 63 and another sum

1) what is 54+63? it's 117!

2) what is their gcf? well, they''re both divisible by 9:

54=9*6

63=9*7

and 6 and 7 have no divisors in common other than 1, so gcf is actually 9!

so what is 117 as a sum of 9 and something else?

the something else s 117-9=108

so the answer is 9+108