Example: 30 and 42
30/2 = 15/3 = 5/5 = 1
42/2 = 21/3 = 7/7 = 1
2 x 3 x 5 = 30
2 x 3 x 7 = 42
Combine the factors, eliminating duplicates.
2 x 3 x 5 x 7 = 210, the LCM
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It is: 2*2*7 = 28
It is: 2*5*5*5 = 250
As a product of its prime factors: 2*2*2*17*179 = 24344
84 2 42 3 21 7 84=2^2*3*7
The LCM is 12.