What is the GCF of 72 90 and 144?

The factors of 72 are:

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

The factors of 90 are:

1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90

The factors of 144 are:

1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 36, 48, 72, 144

The common factors are:

1, 2, 3, 6, 9, 18

The Greatest Common Factor (GCF) is:

18