1) Express 12 as a product of prime factors. a) 2 x 2 x 3 b) 1 x 12 c) 3 x 4 d) 2 x 6 2) Express 18 as a product of prime factors. a) 2 x 3 x 3 b) 1 x 18 c) 2 x 9 d) 3 x 6 3) Express 20 as a product of prime factors. a) 2 x 2 x 5 b) 1 x 20 c) 2 x 10 d) 4 x 5 4) Express 30 as a product of prime factors. a) 2 x 3 x 5 b) 1 x 30 c) 3 x 10 d) 5 x 6 5) Express 42 as a product of prime factors. a) 2 x 3 x 7 b) 1 x 42 c) 6 x 7 d) 2 x 21 6) Express 60 as a product of prime factors. a) 2 x 2 x 3 x 5 b) 1 x 60 c) 3 x 20 d) 4 x 15 7) Express 72 as a product of prime factors. a) 2 x 2 x 2 x 3 x 3 b) 1 x 72 c) 6 x 12 d) 8 x 9 8) Express 84 as a product of prime factors. a) 2 x 2 x 3 x 7 b) 1 x 84 c) 4 x 21 d) 6 x 14 9) Express 90 as a product of prime factors. a) 2 x 3 x 3 x 5 b) 1 x 90 c) 9 x 10 d) 5 x 18 10) Express 100 as a product of prime factors. a) 2 x 2 x 5 x 5 b) 1 x 100 c) 4 x 25 d) 10 x 10 11) Express 120 as a product of prime factors. a) 2 x 2 x 2 x 3 x 5 b) 1 x 120 c) 12 x 10 d) 4 x 30 12) Express 144 as a product of prime factors. a) 2 x 2 x 2 x 2 x 3 x 3 b) 1 x 144 c) 12 x 12 d) 8 x 18

Prime Factorisation

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