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Example: 30 and 42
Factor them.
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

For more common multiples, multiply 210 by successive counting numbers. 210 x 2, 210 x 3, etc.

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