1) Prime numbers from 1to 20 a) 1,3,5,7,9,11,13,15,17,19. b) 1,2,3,5,7,9,11,13,15,17,19 c) 1,2,3,4,5,7,11,13,15,17,19 d) 2,3,5,7,11,13,17,19. 2) State true or false: 1 is a prime number. a) True b) False 3) Prime factorisation of 50 is a) 2x25 b) 10x5 c) 2x2x5x5 d) 2x5x5 4) HCF of 20 and 30 is a) 5 b) 15 c) 10 d) 50 5) LCM of 20 and 30 is a) 50 b) 10 c) 40 d) 60
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