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Least Common Multiple (LCM)
The smallest nonzero whole number that is a multiple of
two or more whole numbers .

Example:
What is the lest common multiple of 3,4 and 6
1. list the multiples for each number

3     3,6,9,12,15,18,21,24,27,30,33,36.....
4     4,8,12,16,20,24,28,32,36,40,44,48.....
6     6,12,18,24,30,36,42,48,54,60,66,72.....

2. List the smallest multiple of each number  
12, 24, 36.....

3. 12 is smallest of the three number, so the LCM =
12
Least Common Multiple (LCM)