Factor and multiples

Which of the following is a factor of 18?

• 3

• 4

• 7

• 8

Given that 3 and 7 are factors of a number Q. Which of the following is the value of Q?

• 12

• 24

• 36

• 42

Which of the following numbers are prime factors of 91?

• 2, 3 and 7

• 5, 7 and 13

• 11 and 13

• 7 and 13

Which of the following numbers is the greatest common factor (GCF) of 60 and 90

• 5

• 15

• 30

• 45

Which of the following is not common factor of 56 and 64?

• 1

• 2

• 3

• 4

Which of the following is not a prime factor of 30?

• 2

• 3

• 5

• 7

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

• 60

• 70

• 80

• 90

30 is a lowest common multiple (LCM) of 5 and x. Find the smallest value of x.

• 7

• 6

• 9

• 8

Which of the following are prime factors of 42?

• 1, 2, 3

• 2, 3, 6

• 2, 3, 7

• 2, 7, 21

Which of the following numbers has only two prime factors?

• 15

• 30

• 32

• 70