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The LCM of 15 and 20 is 60. That is the multiple of the combined prime factors of both numbers (2 x 2 x 3 x 5).

The multiples of 15 are 15, 30, 45, 60, and so on. The multiples of 20 are 20, 40, 60, and so on. Thus 60 is the first number that can be made from multiples of both 15 and 20.

Least Common Multiple (LCM) for 15 20 is 60


60
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7y ago

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