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Factor them.

2 x 2 x 5 = 20

2 x 3 x 3 x 5 = 90

Combine the highest number of each factor.

2 x 2 x 3 x 3 x 5 = 180, the LCM

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9y ago
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9y ago

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Q: What is the least common multiple of 20 45 and 90?
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