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3 x 5 = 15

2 x 2 x 5 = 20

2 x 2 x 3 x 5 = 60, the LCM

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9y ago

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12y ago

In this case, you can just try out multiples of 20 (20 x 1, 20 x 2, etc.), and see which of them is also a multiple of 15.

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Q: How do you find the LCM of 15 and 20?
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