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Old 11-29-2011   #1
Jonathan W
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How do you find the Least Common Multiple of 36, 60, and 135 using Prime Factorization?



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Old 11-29-2011   #2
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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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Old 11-29-2011   #3
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Thank you. I just finished that problem a few minutes ago and that's the answer I got. Is the Greatest Common Factor for those numbers 180?
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Old 11-29-2011   #4
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No, the GCF of 36, 60, and 135 is 3.
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Old 11-29-2011   #5
Jonathan W
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Oh. That's what I had as my answer before but I changed it.
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Old 11-30-2011   #6
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smarty pants. i hate lcm its too much work
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Old 11-30-2011   #7
Jonathan W
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I know. Do you use factor trees or list out all of the multiples?
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Old 12-01-2011   #8
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i love LCM it really easy
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Old 01-08-2012   #9
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Quote:
Originally Posted by orishorjo View Post
i love LCM it really easy
ya i love lcm gcf. thats one of my favs in math
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Old 01-09-2012   #10
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Quote:
Originally Posted by zacmarz View Post
ya i love lcm gcf. thats one of my favs in math
me too
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