1) Which of these is a factor of 36? a) 7 b) 9 c) 11 d) 13 2) Which number has exactly 3 factors? a) 4 b) 9 c) 6 d) 7 3) Which is a common factor of 20 and 30? a) 4 b) 5 c) 8 d) 10 4) Which is the greatest common factor of 16 and 24? a) 4 b) 6 c) 8 d) 12 5) Which statement is true? a) 12 has more factors than 15 b) 15 has more factors than 12 c) They have the same number of factors d) Both are prime 6) Which of these is a multiple of 12? a) 22 b) 24 c) 28 d) 30 7) The first three multiples of 9 are: a) 9, 18, 27 b) 9, 10, 11 c) 3, 6, 9 d) 18, 27, 36 8) Which is the lowest common multiple of 5 and 6? a) 10 b) 20 c) 30 d) 60 9) Which is the lowest common multiple of 4 and 10? a) 20 b) 40 c) 10 d) 12 10) Which of these numbers is both a multiple of 3 and a multiple of 4? a) 6 b) 9 c) 12 d) 15 11) Which of these is the only even prime number? a) 0 b) 1 c) 2 d) 4 12) Which of these numbers is prime? a) 21 b) 23 c) 25 d) 27 13) Which prime number comes just before 20? a) 17 b) 18 c) 19 d) 20 14) Which number is NOT prime? a) 29 b) 31 c) 33 d) 37 15) Which prime numbers add up to 10? a) 2 + 5 b) 3 + 7 c) 2 + 7 d) 5 + 7 16) Which number is a factor of 42 and also a multiple of 3? a) 2 b) 6 c) 7 d) 9 17) Which of these pairs are NOT co-prime? a) 4 and 9 b) 7 and 10 c) 8 and 15 d) 9 and 12 18) If a number is divisible by both 2 and 3, it must also be divisible by: a) 4 b) 5 c) 6 d) 12 19) Which of the following is correct? a) All even numbers are prime b) All odd numbers are prime c) Some odd numbers are prime, some are not d) No odd numbers are prime 20) Which number between 30 and 40 is prime? a) 31 b) 32 c) 33 d) 35

Factors, Multiples & Primes – Set 2

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