How to Find the Greatest Common Factor for 15 and 40

How to Find the Greatest Common Factor for 15 and 40 To find the Greatest Common Factor (GCF) of 15 and 40, follow these steps: 1. List the factors of each number: Factors of 15: 1, 3, 5, 15 Factors of 40: 1, 2, 4, 5, 8, 10, 20, 40 2. Identify the common factors: The common factors between 15 and 40 are: 1, 5 3. The greatest common factor is the largest number in the list of common factors: The GCF of 15 and 40 is 5.