What is the greatest common factor of 32 and 56?

The GCF of 32 and 56 is 8

First find the prime factors of each number:

32: 2 x 2 x 2 x 2 x 2

56: 2 x 2 x 2 x 7

The GCF will be all the prime factors common to both numbers.

In this case it will be 2 x 2 x 2 = 8.
The GCF is 8.