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Factor them.

2 x 2 x 3 x 7 = 84

2 x 3 x 3 x 5 = 90

Combine the highest amount of each factor.

2 x 2 x 3 x 3 x 5 x 7 = 1260, the LCM

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Q: How do you find the least common multiple of 84 and 90?
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