How to Find the Greatest Common Factor for 16 and 48 To find the Greatest Common Factor (GCF) of 16 and 48: 1. List the factors of each number: Factors of 16: 1, 2, 4, 8, 16 Factors of 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48 2. Identify the common factors: 1, 2, 4, 8, 16 3. The greatest common factor is: 16 Therefore, the GCF of 16 and 48 is 16.