Question: what is the greatest common factor in 72 and 48?
Answer: 2 × 2 × 2 × 3 = 24 Therefore, the greatest common factor of 48 and 72 is 2 × 2 × 2 × 3 = 24. If we write down the factors of 12 and 15, they are: Factors of 12: 1, 2, 3, 4, 6, 12 Factors of 15: 1, 3, 5, 15 The greatest common factor (abbreviated GCF) is the largest common factor.