Practice the questions given in the worksheet on factors and multiples.
1. Find out the even numbers.
27, 36, 48, 125, 360, 453, 518, 423, 54, 58, 917, 186, 423, 928, 358
2. Find out the odd numbers.
10, 45, 78, 146, 347, 543, 495, 638, 497, 968, 729, 427, 624, 572
3. Write the factors of the following:
(i) 27
(ii) 32
(iii) 18
(iv) 45
(v) 25
(vi) 56
(vii) 68
(viii) 38
(ix) 72
(x) 56
(xi) 49
(xii) 30
(xiii) 95
(xiv) 36
(xv) 84
4. Write the first five multiples of the following:
(i) 4
(ii) 3
(iii) 7
(iv) 9
(v) 5
(vi) 8
(vii) 12
(viii) 15
5. Find the first three multiples of 8.
6. Find the missing factors.
(i) 7 × ___ = 56
(ii) 5 × ___ = 30
(iii) ___ × 3 = 24
(iv) ___ × 9 = 72
(v) 6 × ___ = 48
(vi) 8 × ___ = 72
7. Write the multiples of 6 which are greater than 20 and less than 50.
8. Write all the prime numbers between 1 and 15.
9. Write all the composite numbers between 1 and 30.
10. Write all the prime numbers between the following:
(i) 31 and 50
(ii) 50 and 90
(iii) 61 and 80
(iv) 91 and 100
11. Write all the composite numbers between the following:
(i) 40 and 50
(ii) 75 and 90
(iii) 25 and 35
(iv) 50 and 70
12. Encircle prime numbers.
21, 31, 49, 59, 63, 73, 91, 97, 40, 56, 37
`13. Which of the following statements are correct?
(i) 1 is a composite number.
(ii) All the odd numbers are the prime numbers.
(iii) A composite numbers has at least 3 factors.
(iv) A number is the greatest factor of itself.
(v) 1 is a factor of every number.
(vi) The multiples of a number are limited.
(vii) A prime number is always even
(viii) A number is either composite or prime.
(ix) A prime number has only two factors.
(x) Every multiple of a number is exactly divisible by the number.
Answers for the worksheet on factors and multiples are given below.
Answers:
1. 36, 48, 360, 518, 54, 58, 186, 928, 358
2. 45, 347, 543, 495, 497, 729, 427
3. (i) 1, 3, 9, 27
(ii) 1, 2, 4, 8, 16, 32
(iii) 1, 2, 3, 6, 9, 18
(iv) 1, 3, 5, 9, 15, 45
(v) 1, 5, 25
(vi) 1, 2, 4, 7, 8, 14, 28, 56
(vii) 1, 2, 4, 17, 34, 68
(viii) 1, 2, 19, 38
(ix) 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
(x) 1, 2, 4, 7, 8, 14, 28, 56
(xi) 1, 7, 49
(xii) 1, 2, 3, 5, 6, 10, 15, 30
(xiii) 1, 5, 19, 95
(xiv) 1, 2, 3, 4, 6, 9, 12, 18, 36
(xv) 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84
4. (i) 4, 8, 12, 16, 20
(ii) 3, 6, 9, 12, 15
(iii) 7, 14, 21, 28, 35
(iv) 9, 18, 27, 36, 45
(v) 5, 10, 15, 20, 25
(vi) 8, 16, 24, 32, 40
(vii) 12, 24, 36, 48, 60
(viii) 15, 30, 45, 60, 75
5. 8, 16, 24
6. (i) 8
(ii) 6
(iii) 8
(iv) 8
(v) 8
(vi) 9
7. 24, 30, 36, 42, 48
8. 2, 3, 5, 7, 11, 13
9. 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30
10. (i) 31, 37, 41, 43, 47
(ii) 53, 59
(iii) 61, 67, 71, 73, 79
(iv) 97
11. (i) 42, 44, 45, 46, 48, 49, 50
(ii) 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90
(iii) 25, 26, 27, 28, 30, 32, 33, 34, 35
(iv) 40, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 70
12. 31, 59, 73, 97, 37
13. (iii), (iv), (v), (ix), (x)
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