Factor  56−16 56−16   using the gcf. i tried it and its not 8

It is eight. There is no way it's wrong I doubled checked.

The prime factorization of 56= 2 x 2 x 2 x 7
The prime factorization of 16= 2 x 2 x 2 x 2= 2^4

There are 3 common 2’s and then you multiply 2 x 2 x 2= 8

So the answer is 8.