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In order to find the LCM, you first split the two numbers into their factors:

15 is 5x3

12 is 3x2x2

Then you ignore any duplicate factors. In this case 3 is a factor of both, so we only need to count 3 once. We're left with 5,3,2 and 2.

Multiply all these numbers together to get the LCM of 15 and 12:

5x3x2x2=60

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13y ago

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The least common factor of any set of integers is 1.

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8y ago
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Q: What is the lcf of 12 and 15?
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