1) Which of the following is NOT a factor of 12? a) 2 b) 3 c) 5 d) 6 2) Which of these is a factor of 18? a) 5 b) 6 c) 7 d) 11 3) What is the greatest factor of any number? a) 1 b) The number itself c) Half the number d) 0 4) Which is a common factor of 24 and 36? a) 4 b) 5 c) 9 d) 11 5) Which of the following numbers is a factor of both 30 and 45? a) 2 b) 3 c) 7 d) 10 6) Which of these is a multiple of 7? a) 20 b) 21 c) 22 d) 25 7) Which is the lowest common multiple (LCM) of 3 and 4? a) 6 b) 8 c) 9 d) 12 8) Which of these is NOT a multiple of 5? a) 25 b) 30 c) 32 d) 35 9) Which of these numbers is a multiple of both 2 and 9? a) 9 b) 12 c) 18 d) 27 10) The first three multiples of 6 are: a) 6, 12, 18 b) 6, 7, 8 c) 12, 18, 24 d) 3, 6, 9 11) Which of these is a prime number? a) 9 b) 15 c) 13 d) 21 12) Which of these numbers is NOT prime? a) 2 b) 7 c) 11 d) 12 13) What is the smallest prime number? a) 0 b) 1 c) 2 d) 3 14) Which of the following is a prime number between 10 and 20? a) 14 b) 15 c) 17 d) 18 15) Which of the following is NOT a prime number? a) 19 b) 23 c) 25 d) 29 16) Which statement is true? a) All prime numbers are even b) All multiples of 2 are even c) All factors are larger than the number d) 1 is a prime number 17) The highest common factor (HCF) of 12 and 18 is: a) 2 b) 3 c) 6 d) 12 18) The lowest common multiple (LCM) of 8 and 12 is: a) 16 b) 24 c) 36 d) 48 19) Which set shows only prime numbers? a) 2, 3, 5, 7 b) 2, 4, 6, 8 c) 3, 6, 9, 12 d) 5, 10, 15, 20 20) Which pair of numbers are co-prime (no common factors except 1)? a) 6 and 9 b) 8 and 15 c) 12 and 18 d) 10 and 20

MCQs: Factors, Multiples & Primes

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