Factors, multiples and primes.

What is a factor of 12?

• 6
• 5
• 10
• 8

Which of the following is a prime number?

• 9
• 7
• 12
• 15

What is the lowest common multiple (LCM) of 4 and 5?

• 20
• 10
• 15
• 25

Which number is a multiple of 3?

• 14
• 10
• 9
• 8

Which of these numbers is not a prime number?

• 11
• 13
• 21
• 17

What is a common factor of 8 and 12?

• 4
• 6
• 10
• 2

Which number is a factor of 24?

• 9
• 7
• 5
• 3

What is the highest common factor (HCF) of 16 and 24?

• 8
• 4
• 2
• 6

What is the smallest prime number?

• 2
• 1
• 3
• 4

Which of the following numbers has exactly two factors?

• 9
• 6
• 5
• 12