Answer :
The common factors of 56 is as follows:
1, 2, 4, 7, 8, 14, 28 and 56
The common factors of 64 is as follows:
1, 2, 4, 8, 16, 32, and 64
As you can see, 8 is the greatest common factor
1, 2, 4, 7, 8, 14, 28 and 56
The common factors of 64 is as follows:
1, 2, 4, 8, 16, 32, and 64
As you can see, 8 is the greatest common factor