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Chapter # 07
Factors and Multiples
1. Out of 52, 62, 70, 82, 78, 66, the numbers
that have 13 as factors are
(a) 52, 78 (b) 66, 78
(c) 70, 78 (d) 62, 82
2. The first four multiples of 7 are:
(a) 7, 9, 11, 13 (b) 35, 42, 49, 56
(c) 1, 2, 3, 5 (d) 7, 14, 21, 28
3. The factors of 50 are
(a) 1, 2, 5, 10, 25, 50
(b) 1, 2, 4, 10, 25, 50
(c) 1, 2, 5, 10, 24
(d) 1, 2, 3, 4, 5, 10, 25, 50
4. In a proper order, the first five factors of 80
are
(a) 1, 2, 3, 4, 5 (b) 1, 2, 4, 5, 8
(c) 1, 3, 5, 10, 20 (d) 1, 2, 3, 5, 10
5. The first five multiples of 8 are
(a) 24, 32, 40, 48, 54 (b) 2, 4, 8, 6, 10
(c) 8, 16, 24, 32, 40 (d) 1, 2, 3, 4, 5
6. Factors of 30 are
(a) 2, 3, 5
(b) 1, 2, 3, 5, 10
(c) 1, 2, 3, 10, 15
(d) 1, 2, 3, 5, 6, 10, 15, 30
7. List the prime factorization of 24.
(a) 2×2×2×3 (b) 3×2×4
(c) 3×8 (d)12×2
8. What are the common factors of 9 and 36 ?
(a) 1,3,9 (b) 1,4,3,5,9
(c) 1,4,5 (d) 1,3,4,9
9. Find the number of multiples of 5.
(a) 100 (b) 600
(c) 700 (d) infinite
10. The sum of the factors of 25 is
(a) 7 (b) 6
(c) 31 (d) 26
11. What are the common factors of 25 and 36?
(a) 1 (b) 5, 6
(c) There are no common factors of 25 and
36.
(d) None of These
12. What are the common factors of 12 and 56?
(a) 1, 4 (b) 2, 4
(c) 1, 2, 4 (d) None Of These
13. What are all the factors of 36?
(a) 2, 3, 4, 9, 12, 18
(b) 1, 2, 3, 4, 6, 9, 12, 18, 36
(c) 2, 3
(d) None of These
14. Factors of 32 are:
(a) 1, 2, 3, 4, 8, 16, 32
(b) 2, 3, 4, 8, 16, 32
(c) 2, 4, 8, 16, 32
(d) 1, 2, 4, 8, 16, 32
15. Write factors of 21
(a) 1, 7, 21 (b) 1, 3, 7, 9, 21
(c) 1, 3, 7, 21, (d) 3, 7, 21
16. Which of the following is a factor of 36?
(a) 5 (b) 6
(c) 7 (d) 10
17. What is the smallest multiple of 9?
(a) 9 (b) 1
(c) 18 (d) 0
18. Which number is a multiple of both 4 and
6?
(a) 10 (b) 12
(c) 14 (d) 16
19. What is a factor of 100?
(a) 3 (b) 10
(c) 7 (d) 9
20. Which number is not a factor of 24?
(a) 2 (b) 3
(c) 5 (d) 8
21. Which of these numbers is divisible by 6?
(a) 25 (b) 30
(c) 42 (d) 33
22. Which of the following is a common factor
of 16 and 20?
(a) 3 (b) 4
(c) 5 (d) 2
23. Which number has exactly 3 factors?
(a) 5 (b) 4
(c) 9 (d) 6 Mathematics by Suraj Sharma P-38