Factors and multiples

List all the factors of 39

• 1,3,39

• 1,3,13,39

• 1,3,6,9,13

• 1,3,9,13,39

Which of the following is not a factor of 24?

• 1

• 2

• 4

• 5

What are the common factors of 12 and 18?

• 1,2,3,6

• 2,3,6

• 3,6

• 6

Find the lowest common multiple (LCM) of 12 and 30.

• 6

• 11

• 30

• 60

Which of the following expresses 180 in the form of prime factorisation correctly?

• 2×3×5

• 4×5×9

• 2×2×2×3×5

• 2×2×3×3×5

Which of the following are the prime factors of 42?

• 1,2,3

• 2,3,7

• 2,7,21

• 3,7,14

Which of the following numbers is the highest common factor (HCF) of 60 and 90?

• 5

• 15

• 30

• 45

What is the highest common factor (HCF) of 18,27 and 36?

• 3

• 6

• 9

• 12

What is the lowest common multiple (LCM) of 6,15 and 18?

• 60

• 70

• 80

• 90

Which of the following statements is true?

• 4 is a factor of 10

• 6 is a factor of 18

• 5 is a factor of 106

• 7 is a factor of 125