The GCF of 8, 12, and 16 is 4. Factor out each term to obtain: 8 = 2³ 12 = 2² x 3 16 = 2^4 Since these terms have the factors 2² in common, the GCF is 2² = 4. The GCF is 4.

The factors of 8 are: 1, 2, 4, 8 The factors of 12 are: 1, 2, 3, 4, 6, 12 The factors of 20 are: 1, 2, 4, 5, 10, 20 The Greatest Common Factor: GCF = 4