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Factor them.

3 x 5 = 15

39

3 x 3 x 5 = 45

Combine the factors, eliminating duplicates.

3 x 3 x 5 x 39 = 1755, the LCM.

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Q: How do you find the LCM of 15 39 and 45?
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Related questions

What is the least common multiple of 3915?

You need at least two numbers to find an LCM. If that's 39 and 15, the LCM is 195. If that's 3, 9 and 15, the LCM is 45.


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