Multiple & Factors Worksheet-3

Multiple & Factors Worksheet-3

1. Which option shows common multiples of 15 and 20?

A. 60, 120          B. 75, 90            C. 80, 120          D. 60, 105

2. Which option shows the prime factorization of 12?

A. 2×2×3           B. 2×3×4           C. 3×3×4           D. 2×2×2

3. Which option shows the prime factorization of 30?

A. 2×2×5           B. 2×3×5           C. 2×3×6           D. 2×4×5

4. Choose the CORRECT answer.

A. 3 and 6 are prime numbers 

B. 5 and 8 are prime numbers

C. 4 and 11 are composite numbers

D. 8 and 15 are composite numbers

5. Find the GCF of 36 and 54.

A. 36                   B. 18                    C. 30                   D. 72

6. Which option shows a prime number?

A. 88                   B. 131                  C. 64                   D. 62

7. What are the common factors of 10 and 21?

A. 1, 3, 7             B. 1                      C. 2                     D. 1, 2, 5, 10

8. Which option shows all the common factors of 15 and 45?

A. 1, 3, 5, 5, 15 B. 1, 2, 4, 8        C. 1, 5, 15           D. 1, 3, 5, 15

9. Find the Greatest Common Factor of 14 and 28.

A. 7                      B. 28                   C. 2                     D. 14

10. Find the Greatest Common Factor (GCF) of 17 and 23.

A. 17                    B. 23                   C. 1                      D. 69

Answer Key:

(1)-A; (2)-A; (3)-B; (4)-D; (5)-B; (6)-B; (7)-B; (8)-D; (9)-D; (10)-C