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The quickest way to find a common multiple of two numbers is to multiply the two numbers together. Keep adding that number to itself and the results will all be common multiples. The LCM usually requires some factoring. Example: 30 and 42

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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