Choose the letter of the best answer. Write the chosen letter on a separate sheet of paper.
1. Which of the following numbers are common factors of 8 and 12?
A. 1 and 2 B. 1, 2 and 3 C. 1, 2 and 4 D. 1, 2, 4 and 8
2. Numbers 1, 2 and 4 are common factors of what numbers?
A. 2 and 8 B. 4 and 6 C. 6 and 8 D. 8 and 12
3. What are the common factors of 12 and 18?
A. 1, 2 and 3 B. 1, 2 and 6 C. 1, 3 and 6 D. 1, 2, 3 and 6
4. Among the common factors of 12 and 18, which is the highest?
A. 2 B. 3 C. 6 D. 9
5. What are the common factors of 16 and 24?
A. 1, 2 and 4 B. 1, 2, 4 and 8 C. 4 and 8 D. 4, 8 and 12
6. Among the common factors of 16 and 24, which is the highest?
A. 2 B. 4 C. 8 D. 12
7. How many common factors of 32 and 48 are there in all?
A. 3 B. 4 C. 5 D. 6
8. Which of the following numbers is a common factor of 22 and 143? A. 3 B. 4 C. 8. D. 11
9. Which number is a common divisor of 16 and 24?
A. 8 B. 9 C. 10 D. 12
10. Which of the following sets of numbers have 1, 4 and 11 as some of their common factors?
A. 4 and 11 B. 8 and 22 C. 22 and 44 D. 44 and 88​