1) LCM (Least Common Multiple) The smallest positive number that is a multiple of two or more numbers. a) True b) False 2) HCF (Highest Common Factor) The highest number that divides exactly into two or more numbers. It is the "greatest" thing for simplifying fractions! a) True b) False 3) What is the HCF between 18 and 48? a) 2 b) 6 c) 8 d) 12 4) What is the HCF between 28 and 52? a) 2 b) 4 c) 12 d) 28 5) What is the HCF between 21 and 28? a) 1 b) 7 c) 14 d) 21 6) What is the HCF between 15 and 35? a) 15 b) 10 c) 2 d) 5 7) What is the LCM of 4 and 9? a) 36 b) 24 c) 72 d) 40 8) What is the LCM of 30 and 24? a) 60 b) 90 c) 120 d) 160 9) What is the LCM of 8 and 10? a) 20 b) 40 c) 80 d) 120

HCF & LCM

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