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Old 11-29-2011   #2
Mr. Hui


 
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Join Date: Mar 2005
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First you need to find the prime factorization of each number. You can use a factor tree to organize your factors.

Factors of

Code:
 36: 2 x 2 x 3 x 3
 60: 2 x 2 x 3 x         5
135:         3 x 3 x 3 x 5
* Note how the prime factors are neatly lined up.

The LCM is 2 x 2 x 3 x 3 x 3 x 5 = 540.
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