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 dot array labelled with rows and columns. — Arrays show equal rows and columns for multiplication and division.

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

What is the square root of 196?

A 14 B 13 C 98 D 15

Question 22

Which of these numbers is prime: 38?

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

Question 23

Which of these numbers is prime: 6?

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

Question 24

Find the lowest common multiple (LCM) of 11 and 5.

A 55__0 B 66 C 50 D 55

Question 25

Find the lowest common multiple (LCM) of 10 and 3.

A 27 B 30__0 C 40 D 30

Question 26

What is the square root of 121?

A 11 B 60 C 12 D 10

Question 27

Find the lowest common multiple (LCM) of 3 and 8.

A 27 B 24__0 C 24 D 16

Question 28

Find the lowest common multiple (LCM) of 15 and 10.

A 45 B 30 C 20 D 150

Question 29

What is the square root of 225?

A 15 B 112 C 16 D 14

Question 30

What is the square root of 81?

A 8 B 40 C 10 D 9

Question 31

Find the highest common factor (HCF) of 27 and 24.

A 3 B 2 C 4 D 6

Question 32

Find the lowest common multiple (LCM) of 9 and 10.

A 90 B 80 C 90__0 D 99

Question 33

Which of these numbers is prime: 31?

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

Question 34

Find the highest common factor (HCF) of 20 and 38.

A 2 B 3 C 1 D 4

Question 35

Find the highest common factor (HCF) of 50 and 15.

A 4 B 5 C 10 D 6

Question 36

Find the highest common factor (HCF) of 45 and 33.

A 2 B 3 C 4 D 6

Question 37

Which of these numbers is prime: 40?

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

Question 38

Find the lowest common multiple (LCM) of 12 and 14.

A 70 B 96 C 84 D 168

Question 39

Find the lowest common multiple (LCM) of 3 and 13.

A 39__0 B 39 C 42 D 26

Question 40

Find the lowest common multiple (LCM) of 7 and 14.

A 21 B 14 C 98 D 0

Question 41

Find the lowest common multiple (LCM) of 7 and 8.

A 48 B 56__0 C 63 D 56

Question 42

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

A 182__0 B 182 C 168 D 195

Question 43

Find the lowest common multiple (LCM) of 13 and 11.

A 156 B 143 C 143__0 D 132

Question 44

Find the highest common factor (HCF) of 30 and 29.

A 2 B 1__0 C 1 D 1__1

Question 45

Which of these numbers is prime: 5?

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

Question 46

What is the square root of 16?

A 4 B 3 C 8 D 5

Question 47

Find the highest common factor (HCF) of 44 and 35.

A 1 B 2 C 1__1 D 1__0

Question 48

Find the lowest common multiple (LCM) of 12 and 4.

A 8 B 48 C 12 D 24

Question 49

Find the lowest common multiple (LCM) of 15 and 9.

A 60 B 45 C 135 D 36

Question 50

Which of these numbers is prime: 24?

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

Question 51

Find the highest common factor (HCF) of 9 and 33.

A 2 B 6 C 4 D 3

Question 52

Which of these numbers is prime: 15?

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

Question 53

What is the square root of 36?

A 18 B 5 C 6 D 7

Question 54

Find the highest common factor (HCF) of 17 and 32.

A 1__0 B 1__1 C 1 D 2

Question 55

Which of these numbers is prime: 11?

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

Question 56

Which of these numbers is prime: 7?

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

Question 57

Find the lowest common multiple (LCM) of 10 and 15.

A 40 B 150 C 30 D 15

Question 58

Find the lowest common multiple (LCM) of 7 and 10.

A 60 B 70 C 70__0 D 77

Question 59

Find the highest common factor (HCF) of 31 and 16.

A 1 B 1__0 C 2 D 1__1

Question 60

Find the highest common factor (HCF) of 6 and 26.

A 3 B 4 C 1 D 2

Question 61

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

A 0 B 14 C 28 D 196

Question 62

What is the square root of 9?

A 2 B 3__0 C 3 D 4

Question 63

Find the highest common factor (HCF) of 11 and 34.

A 1__1 B 1__0 C 1 D 2

Question 64

Find the highest common factor (HCF) of 46 and 12.

A 4 B 3 C 2 D 1

Question 65

Find the lowest common multiple (LCM) of 5 and 10.

A 0 B 50 C 10 D 15

Question 66

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

A 7 B 14 C 0 D 49

Question 67

What is the square root of 64?

A 32 B 8 C 7 D 9

Question 68

Find the lowest common multiple (LCM) of 5 and 4.

A 20 B 25 C 20__0 D 16

Question 69

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

A 5 B 10 C 12 D 10__0

Question 70

Find the lowest common multiple (LCM) of 3 and 6.

A 9 B 0 C 18 D 6

Question 71

Find the highest common factor (HCF) of 33 and 49.

A 1 B 1__1 C 1__0 D 2

Question 72

Find the highest common factor (HCF) of 19 and 42.

A 1__0 B 1__1 C 1 D 2

Question 73

Find the highest common factor (HCF) of 19 and 29.

A 1 B 2 C 1__1 D 1__0

Question 74

Find the highest common factor (HCF) of 50 and 43.

A 1 B 2 C 1__0 D 1__1

Question 75

Find the highest common factor (HCF) of 32 and 6.

A 3 B 1 C 4 D 2

Question 76

What is the square root of 144?

A 13 B 72 C 11 D 12

Question 77

Which of these numbers is prime: 10?

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

Question 78

Find the highest common factor (HCF) of 19 and 15.

A 1 B 1__1 C 1__0 D 2

Question 79

Which of these numbers is prime: 37?

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

Question 80

What is the square root of 49?

A 7 B 24 C 6 D 8

Question 81

Find the lowest common multiple (LCM) of 5 and 13.

A 65 B 70 C 52 D 65__0

Question 82

Find the highest common factor (HCF) of 43 and 20.

A 1__0 B 2 C 1__1 D 1

Question 83

Which of these numbers is prime: 46?

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

Question 84

Which of these numbers is prime: 26?

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

Question 85

Which of these numbers is prime: 2?

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

Question 86

Which of these numbers is prime: 14?

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

Question 87

Find the lowest common multiple (LCM) of 12 and 6.

A 12 B 24 C 72 D 6

Question 88

Find the highest common factor (HCF) of 27 and 22.

A 1__1 B 1 C 1__0 D 2

Question 89

Which of these numbers is prime: 42?

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

Question 90

Find the lowest common multiple (LCM) of 9 and 7.

A 72 B 63__0 C 56 D 63

Question 91

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

A 6 B 3 C 0 D 9

Question 92

Find the highest common factor (HCF) of 37 and 22.

A 1__1 B 1__0 C 2 D 1

Question 93

Find the lowest common multiple (LCM) of 5 and 15.

A 20 B 75 C 15 D 0

Question 94

Which of these numbers is prime: 3?

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

Question 95

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

A 45 B 180 C 72 D 60

Question 96

Which of these numbers is prime: 35?

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

Question 97

Find the lowest common multiple (LCM) of 8 and 2.

A 8__0 B 16 C 8 D 6

Question 98

Find the highest common factor (HCF) of 47 and 43.

A 1__0 B 1 C 2 D 1__1

Question 99

Find the lowest common multiple (LCM) of 7 and 6.

A 42__0 B 42 C 49 D 36

Question 100

Find the lowest common multiple (LCM) of 8 and 9.

A 80 B 63 C 72 D 72__0

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