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280.
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The LCM is 56.
Least Common Multiple (LCM) for 56 40 is 280.
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
The LCM is 392.