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​