Activity 3 A: List all the factors of each number. Then, find the common factors and the greatest common factor (GCF) of each pair of numbers. 1. 32 = 40 = Common Factors:_______ 2. 30 = 50 = Common Factors:_______ 3. 18 = 55 = common factors:________ 4. 12 = 18 = common factors:________