What is the gcf of 60 and 72 and 108?

The factors of 60 are:

1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60

The factors of 72 are:

1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72

The factors of 108 are:

1, 2, 3, 4, 6, 9, 12, 18, 27, 36, 54, 108

The common factors are:

1, 2, 3, 4, 6, 12

The Greatest Common Factor:

GCF = 12