1) Which number is a factor of 25? a) 6 b) 2 c) 5 d) 3 2) Which number is not a factor of 12? a) 1 b) 2 c) 6 d) 10 3) A number 2 is always a factor of even numbers. a) TRUE b) FALSE 4) The highest common factor (HCF) of two numbers is the largest number that is a factor of both numbers. a) TRUE b) FALSE 5) Find the HCF of 10 and 15. a) 15 b) 5 c) 1 d) 30 6) Find the HCF of 12 and 18. a) 6 b) 36 c) 2 d) 3 7) Find the HCF of 20 and 30. a) 2 b) 60 c) 10 d) 5 8) Find the HCF of 12 and 24. a) 24 b) 12 c) 6 d) 4 9) Find two numbers with HCF of 6. a) 3 and 6 b) 6 and 12 c) 12 and 24 d) 16 and 66 10) Find two numbers with a HCF of 8. a) 8 and 18 b) 4 and 8 c) 16 and 32 d) 16 and 24

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