i dont understand how to find the LCM of numbers?

Question

can someone show me an easy way to find the LCM of a set of numbers

Answer 1

LCM is just the smallest number that 2 other numbers can go into.
Example: (1/5) + (2/3)
Think least common multipale is 15 because the is the smalles number both 5 & 3 can go into.
so you would have (1/5) * (3/3) + (2/3) * (5/5)
what you do to the bottom you must do to the top.

so this would be (3/15) + (10/15)
does that help? I will show you one that isn't as obvisious.
(1/6) + (1/9)
this would have a LCM of 18.
(1/6) * (3/3) + (1/9) * (2/2)
(3/18) + (2/18)
(5/18)

I hope this all helps. Good Luck

Answer 2

Suppose you want to find the LCM of a set of numbers.
Key: Do them 2 at a time.
To find the LCM of 2 numbers compute their product
divided by their GCD(or GCF).
Example: Let's find the LCM of 12,15,18 and 27.
First: Do 12 and 15: LCM(12,15) = 12*15/3 = 12*5 = 60
Next: Use the answer you just got with 18
LCM(60,18) = 60*18/6 = 60*3 = 180.
Finally, find the LCM of 180 and 27
we get 180*27/9 = 180*3 = 540.
The advantage of this method is that you
don't have to factor all the numbers.

Answer 3

are you kidding me, see here please:
http://answers.yahoo.com/question/index?qid=20070916134645AAj5Ssx&r=w