The Least Common Multiple (LCM) of a group of numbers is the smallest number that is a multiple of all the numbers. For instance, the LCM of 16 and 20 is 80; 80 is the smallest number that is both a multiple of 16 and a multiple of 20. You can find the LCM of two or more numbers through a variety of methods. If you'd like to know how to find the LCM of two or more numbers, just follow these steps. For more information you can refer this link.
http://www.wikihow.com/Find-the-Least-Common-Multiple-of-Two-Numbers