What I Know A Write the letter of the correct answer in your notebook. 1. The common factors of 12, 30 and 42 are a. 1, 2, 3 b. 2, 3, 6 c. 2, 4, 8 d. 5, 10, 15 2. The greatest common factor of 24 and 32 is a. 2 b. 4 c. 6 d. 8 3. The common multiples of 6 and 4 are a. 2, 3, 4 b. 4, 6, 8 c. 8, 12, 16 d. 12, 24, 36 4. The least common multiple of 2, 3, 4 and 5 is a. 20 b. 30 c. 50 d. 60 5. A common multiple of 3, 5, 9 and 10 is b. 30 b. 50 c. 90 d. 100​