Which pair of numbers has a least common multiple of 12 a 3 and 9 b2 and 6 3 and 6 d 3 and 4?

Answer 1

LCM = 12

a) 3 and 9

b) 2 and 3

c) 3 and 6

d) 3 and 4 Correct Answer!

multiples of 3 - 3, 6, 9, 12, 15, 18, 21, 24, 27, 30

multiples of 9 - 9, 18, 27, 36

multiples of 6 - 6, 12, 18, 24, 30

multiples of 4 - 4, 8, 12, 16, 20

multiples of 2 - 2, 4, 6, 8, 10, 12, 14, 16, 18

you can automatically eliminate a) because the multiples of 9 dont even have 12

for b) the least common multiple is 6 and not 12 so this can be eliminated

for c) the least common multiple is also 6 and not 12 so this can be eliminated

d) is the only answer left. and if you take a look 12 is in fact the least common multiple (LCM) for these numbers

Answer 2

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