168
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3 x 56 = 168
lcm(21, 56) = 168. 21 = 3 x 7 56 = 2^3 x 7 lcm = 2^3 x 3 x 7 = 168
LCM(56, 60) = 840 56 = 2^3 x 7 60 = 2^2 x 3 x 5 lcm = 2^3 x 3 x 5 x 7 = 840
3/8 x 56 = 21
33 = (3 x 10) + (3 x 1) 56 = (5 x 10) + (6 x 1)