I. Write the letter of the correct answer on the space provided. 1. Which of the following is a common multiple of 3 and 5? A. 15 B. 20 C. 25 D. 40 2. What is the Greatest Common Factor of 27 and 36? A. 6 B. 7 C. 8 D. 9 3. Which of the following is the Least Common Multiple of 21 and 63? A. 7 B. 21 C. 63 D. 98 4. Which of the following is a common factor of 56 and 72? A. 2 B.5 C. 8 D. Both A and C 5. What is the Greatest Common Factor of 19 and 57? A. 17 B. 18 C. 19 D. 20​