math!
posted by bailey .
how do you do lcm i know i did it in like 1st grade but i need helpp!!

Check this site.
http://www.helpwithfractions.com/leastcommonmultiple.html
If you do one of your own problems, we'll be glad to check it for you. 
To find LCM you must list some of the multiples of the numbers and then find the ones that match which are the same.
eg: Find the LCM of 3 and 5
multiples of 3:3,6,9,12,15
multiples of 5:5,10,15,20,25
So,as you can see the LCM would be 15
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