Question

Find the GCF for the given list. 8, 28

Answer 1

The greatest common factor (GCF) is the biggest number that can multiply into a set of numbers.

List the factors for 8 and 28:

Factors of 8: {1,2,4,8}
Factors of 28: {1,2,4,7,14,28}

There are three common factors between 8 and 28:

1, 2, 4

The biggest number of these three is 4, so the GCF for 8 and 28 will be 4.

Answer 2

The Greatest Common Factor is 4. Choose the biggest number you can find that goes into both numbers.