Need Help With LCM - XP Math - Forums

 XP Math - Forums Need Help With LCM

 11-29-2011 #1 Jonathan W Guest   Posts: n/a Need Help With LCM How do you find the Least Common Multiple of 36, 60, and 135 using Prime Factorization? HELP!!!!!!!!!!!!!!!
 11-29-2011 #2 Mr. Hui Last Achievements     Join Date: Mar 2005 Posts: 10,653 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. __________________ Do Math and you can do Anything!
 11-29-2011 #3 Jonathan W Guest   Posts: n/a 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?
 11-29-2011 #4 Mr. Hui Last Achievements     Join Date: Mar 2005 Posts: 10,653 No, the GCF of 36, 60, and 135 is 3. __________________ Do Math and you can do Anything!
 11-29-2011 #5 Jonathan W Guest   Posts: n/a Oh. That's what I had as my answer before but I changed it.
11-30-2011   #6
jimjim

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smarty pants. i hate lcm its too much work
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 11-30-2011 #7 Jonathan W Guest   Posts: n/a I know. Do you use factor trees or list out all of the multiples?
12-01-2011   #8
orishorjo

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i love LCM it really easy

01-08-2012   #9
zacmarz

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Quote:
 Originally Posted by orishorjo i love LCM it really easy
ya i love lcm gcf. thats one of my favs in math
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01-09-2012   #10
orishorjo

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Quote:
 Originally Posted by zacmarz ya i love lcm gcf. thats one of my favs in math
me too
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