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11292011  #1 
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Need Help With LCM
How do you find the Least Common Multiple of 36, 60, and 135 using Prime Factorization?
HELP!!!!!!!!!!!!!!! 
11292011  #2 
Join Date: Mar 2005
Posts: 10,609

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 The LCM is 2 x 2 x 3 x 3 x 3 x 5 = 540.
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11292011  #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?

11292011  #4 
Join Date: Mar 2005
Posts: 10,609

No, the GCF of 36, 60, and 135 is 3.
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11292011  #5 
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Oh. That's what I had as my answer before but I changed it.

11302011  #6 
Join Date: May 2009
Posts: 370

smarty pants. i hate lcm its too much work
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11302011  #7 
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I know. Do you use factor trees or list out all of the multiples?

12012011  #8 
Join Date: May 2011
Posts: 1,633

i love LCM it really easy

01082012  #9 
Join Date: Nov 2011
Posts: 945

ya i love lcm gcf. thats one of my favs in math
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01092012  #10 
Join Date: May 2011
Posts: 1,633

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