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     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``` * 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     Join Date: Mar 2005 Posts: 10,609 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     Join Date: May 2009 Posts: 370 smarty pants. i hate lcm its too much work __________________ Everything that shines ain't a diamond Tomorrow is a gift that ain't promised Nobody's perfect, we all need alignments And things are understood more with timing live by these words and you'll get far
 02-19-2012 #7 avleen kaur     Join Date: Apr 2011 Posts: 84 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
02-24-2012   #8
avleen kaur

Join Date: Apr 2011
Posts: 84

Quote:
 Originally Posted by Jonathan W How do you find the Least Common Multiple of 36, 60, and 135 using Prime Factorization? HELP!!!!!!!!!!!!!!!
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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