1) Which number has 3 as one of its factors? a) 22 b) 31 c) 10 d) 18 2) What is the HCF of 18 and 24? a) 2 b) 6 c) 8 d) 12 3) What is the HCF of 10 and 20? a) 2 b) 10 c) 4 d) 1 4) Which number is a factor of both 10 and 40? a) 1 b) 4 c) 10 d) 15 5) What is the HCF of 21 and 28? a) 1 b) 7 c) 14 d) 21 6) What is the HCF of 15 and 35? a) 15 b) 10 c) 2 d) 5 7) What is the HCF of 34 and 68? a) 2 b) 12 c) 24 d) 34 8) What is the HCF of 24 and 12? a) 1 b) 12 c) 15 d) 2 9) What is the HCF of 10d and 2d? a) 5d b) 2d c) 2 d) 6 10) What is the HCF of 14k and 7? a) 7 b) 14 c) k d) 7k e) 14k

Highest Common Factor (HCF)

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