Factor them.
7
2 x 2 x 5 = 20
5 x 7 = 35
Combine the highest amount of each factor.
2 x 2 x 5 x 7 = 140, the LCM
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lcm(7, 20, 35) = 140 7 = 7 20 = 2^2 x 5 35 = 5 x 7 lcm = 2^2 x 5 x 7 = 140
The LCM is 175.
The LCM is: 35
The LCM is: 315
LCM of 4 and 5 is 20 LCM of 6 and 3 is 6 LCM of 5 and 7 is 35