Prime, Composite and Square Numbers

Question 1

Which of the following is a prime number?

A 51 B 47 C 49 D 52

Question 2

How many factor pairs does 36 have?

A 4 B 5 C 6 D 9

Question 3

Which number is composite?

A 61 B 67 C 69 D 71

Question 4

What is the next square number after 144?

A 156 B 169 C 176 D 181

Question 5

Which number is divisible by both 6 and 8?

A 48 B 42 C 56 D 64

Question 6

How many prime numbers are between 20 and 30?

A 2 B 3 C 4 D 5

Question 7

What is the smallest composite number?

A 2 B 3 C 4 D 5

Question 8

Which number is NOT a factor of 72?

A 8 B 9 C 11 D 6

Question 9

Which of these is a perfect square?

A 130 B 144 C 145 D 155

Question 10

A number is divisible by 9 if the sum of its digits is divisible by 9. Is 738 divisible by 9?

A Yes, 7+3+8=18 B No, 7+3+8=20 C Yes, 738÷9=82 D No, the rule doesn't apply

Question 11

What is √121?

A 10 B 11 C 12 D 13

Question 12

Which list contains only prime numbers?

A 3, 7, 11, 15 B 5, 13, 17, 23 C 2, 6, 10, 14 D 9, 21, 27, 33

Question 13

What are the factor pairs of 24?

A (1,24), (2,12), (3,8), (4,6) B (1,24), (2,12), (3,8) C (2,12), (3,8), (4,6) D (1,24), (4,6)

Question 14

Is 91 prime or composite?

A Prime B Composite (7×13) C Composite (9×10) D Neither

Question 15

How many factors does 64 have?

A 6 B 7 C 8 D 9

Question 16

Which is the closest perfect square to 77?

A 64 B 81 C 100 D 49

Question 17

A number is divisible by 4 if its last two digits form a number divisible by 4. Is 3,928 divisible by 4?

A Yes, 28÷4=7 B No, 28÷4=6 C Yes, 92÷4=23 D No, 92÷4=23

Question 18

What is the sum of all prime numbers between 10 and 20?

A 60 B 61 C 62 D 63

Question 19

Which of these numbers has the most factors?

A 48 B 50 C 52 D 54

Question 20

Between 40 and 50, which numbers are composite?

A 40, 42, 44, 45, 46, 48, 49 B 40, 42, 44, 45, 46, 48 C All except 41, 43, 47 D 40, 42, 45, 48, 49

Question 21

Which of these numbers is prime: 45?

A Neither B Yes — it is composite C No — it is composite D No — it is prime

Question 22

Find the highest common factor (HCF) of 47 and 16.

A 1__0 B 1 C 2 D 1__1

Question 23

Find the highest common factor (HCF) of 21 and 30.

A 3 B 4 C 6 D 2

Question 24

Find the highest common factor (HCF) of 21 and 49.

A 8 B 7 C 14 D 6

Question 25

Find the highest common factor (HCF) of 41 and 31.

A 2 B 1__1 C 1__0 D 1

Question 26

Find the lowest common multiple (LCM) of 10 and 2.

A 10 B 8 C 20 D 10__0

Question 27

Find the lowest common multiple (LCM) of 2 and 11.

A 24 B 22__0 C 11 D 22

Question 28

Find the highest common factor (HCF) of 24 and 38.

A 1 B 3 C 2 D 4

Question 29

Find the lowest common multiple (LCM) of 5 and 7.

A 28 B 35 C 35__0 D 40

Question 30

What is the square root of 81?

A 10 B 9 C 8 D 40

Question 31

Find the lowest common multiple (LCM) of 15 and 7.

A 105__0 B 120 C 105 D 98

Question 32

Find the lowest common multiple (LCM) of 15 and 12.

A 75 B 60 C 48 D 180

Question 33

Find the highest common factor (HCF) of 27 and 19.

A 1 B 2 C 1__1 D 1__0

Question 34

Find the lowest common multiple (LCM) of 9 and 14.

A 135 B 126__0 C 112 D 126

Question 35

Find the lowest common multiple (LCM) of 3 and 12.

A 0 B 36 C 15 D 12

Question 36

What is the square root of 16?

A 8 B 5 C 4 D 3

Question 37

Find the highest common factor (HCF) of 6 and 6.

A 7 B 5 C 6 D 12

Question 38

Find the highest common factor (HCF) of 17 and 8.

A 1 B 1__0 C 2 D 1__1

Question 39

Which of these numbers is prime: 28?

A No — it is composite B Neither C No — it is prime D Yes — it is composite

Question 40

Find the lowest common multiple (LCM) of 8 and 13.

A 91 B 112 C 104 D 104__0

Question 41

What is the square root of 121?

A 12 B 60 C 10 D 11

Question 42

Find the lowest common multiple (LCM) of 13 and 6.

A 91 B 78 C 72 D 78__0

Question 43

Find the lowest common multiple (LCM) of 5 and 2.

A 8 B 15 C 10 D 10__0

Question 44

What is the square root of 25?

A 12 B 6 C 5 D 4

Question 45

Find the lowest common multiple (LCM) of 9 and 9.

A 0 B 81 C 9 D 18

Question 46

Find the highest common factor (HCF) of 25 and 9.

A 2 B 1__0 C 1__1 D 1

Question 47

Find the highest common factor (HCF) of 14 and 18.

A 4 B 3 C 2 D 1

Question 48

Find the highest common factor (HCF) of 36 and 41.

A 2 B 1__1 C 1 D 1__0

Question 49

Find the lowest common multiple (LCM) of 6 and 8.

A 24 B 30 C 48 D 16

Question 50

What is the square root of 169?

A 12 B 14 C 84 D 13

Question 51

Find the highest common factor (HCF) of 9 and 28.

A 2 B 1__0 C 1 D 1__1

Question 52

Find the highest common factor (HCF) of 38 and 13.

A 1__0 B 1__1 C 2 D 1

Question 53

Find the highest common factor (HCF) of 31 and 47.

A 1__0 B 1__1 C 1 D 2

Question 54

Find the highest common factor (HCF) of 42 and 30.

A 7 B 5 C 12 D 6

Question 55

Find the highest common factor (HCF) of 27 and 36.

A 9 B 8 C 10 D 18

Question 56

Which of these numbers is prime: 31?

A Neither B No — it is prime C Yes — it is composite D Yes — it is prime

Question 57

Which of these numbers is prime: 36?

A No — it is composite B Yes — it is composite C Neither D No — it is prime

Question 58

Find the highest common factor (HCF) of 38 and 37.

A 1__1 B 1__0 C 2 D 1

Question 59

Which of these numbers is prime: 26?

A No — it is composite B Yes — it is composite C Neither D No — it is prime

Question 60

Which of these numbers is prime: 20?

A Yes — it is composite B Neither C No — it is composite D No — it is prime

Question 61

Which of these numbers is prime: 32?

A No — it is prime B Yes — it is composite C No — it is composite D Neither

Question 62

Which of these numbers is prime: 30?

A No — it is composite B No — it is prime C Neither D Yes — it is composite

Question 63

Find the highest common factor (HCF) of 26 and 13.

A 13 B 12 C 26 D 14

Question 64

Find the lowest common multiple (LCM) of 4 and 10.

A 40 B 10 C 20 D 24

Question 65

Find the highest common factor (HCF) of 6 and 28.

A 2 B 4 C 1 D 3

Question 66

Find the lowest common multiple (LCM) of 2 and 13.

A 26 B 13 C 26__0 D 28

Question 67

Find the lowest common multiple (LCM) of 2 and 3.

A 8 B 6__0 C 6 D 3

Question 68

Find the lowest common multiple (LCM) of 13 and 4.

A 52 B 48 C 65 D 52__0

Question 69

Find the highest common factor (HCF) of 38 and 29.

A 1__0 B 1__1 C 2 D 1

Question 70

Find the highest common factor (HCF) of 48 and 46.

A 2 B 3 C 4 D 1

Question 71

Find the highest common factor (HCF) of 17 and 50.

A 1__0 B 2 C 1__1 D 1

Question 72

Which of these numbers is prime: 25?

A Neither B No — it is prime C Yes — it is composite D No — it is composite

Question 73

Which of these numbers is prime: 11?

A Neither B Yes — it is prime C No — it is prime D Yes — it is composite

Question 74

Find the lowest common multiple (LCM) of 15 and 8.

A 135 B 120 C 112 D 120__0

Question 75

What is the square root of 36?

A 7 B 18 C 5 D 6

Question 76

Find the lowest common multiple (LCM) of 6 and 5.

A 25 B 36 C 30__0 D 30

Question 77

Find the lowest common multiple (LCM) of 8 and 15.

A 128 B 105 C 120__0 D 120

Question 78

What is the square root of 64?

A 32 B 8 C 9 D 7

Question 79

Which of these numbers is prime: 5?

A Yes — it is prime B No — it is prime C Yes — it is composite D Neither

Question 80

Which of these numbers is prime: 22?

A No — it is composite B No — it is prime C Yes — it is composite D Neither

Question 81

Find the highest common factor (HCF) of 11 and 10.

A 2 B 1__0 C 1__1 D 1

Question 82

Find the highest common factor (HCF) of 24 and 25.

A 1__0 B 2 C 1 D 1__1

Question 83

Find the lowest common multiple (LCM) of 2 and 4.

A 4 B 6 C 0 D 8

Question 84

What is the square root of 100?

A 10 B 11 C 9 D 50

Question 85

Find the lowest common multiple (LCM) of 13 and 14.

A 182__0 B 195 C 168 D 182

Question 86

Which of these numbers is prime: 19?

A Neither B Yes — it is composite C No — it is prime D Yes — it is prime

Question 87

Find the highest common factor (HCF) of 42 and 43.

A 1 B 1__1 C 2 D 1__0

Question 88

Find the highest common factor (HCF) of 24 and 20.

A 8 B 5 C 4 D 3

Question 89

Find the highest common factor (HCF) of 28 and 12.

A 3 B 4 C 8 D 5

Question 90

Find the lowest common multiple (LCM) of 15 and 11.

A 154 B 165 C 165__0 D 180

Question 91

Which of these numbers is prime: 8?

A Yes — it is composite B No — it is prime C No — it is composite D Neither

Question 92

What is the square root of 4?

A 1 B 3 C 2__0 D 2

Question 93

Which of these numbers is prime: 44?

A No — it is composite B No — it is prime C Neither D Yes — it is composite

Question 94

Find the highest common factor (HCF) of 15 and 12.

A 2 B 6 C 4 D 3

Question 95

Find the highest common factor (HCF) of 44 and 26.

A 3 B 2 C 4 D 1

Question 96

Which of these numbers is prime: 48?

A No — it is composite B Neither C Yes — it is composite D No — it is prime

Question 97

Find the highest common factor (HCF) of 43 and 6.

A 1__0 B 1__1 C 2 D 1

Question 98

Find the highest common factor (HCF) of 36 and 22.

A 1 B 3 C 4 D 2

Question 99

Find the lowest common multiple (LCM) of 12 and 9.

A 48 B 27 C 36 D 108

Question 100

Find the highest common factor (HCF) of 31 and 10.

A 1__0 B 1 C 2 D 1__1

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