70,140,210.
http://wiki.answers.com/Q/What_are_the_first_three...

The Lowest Common Multiple (L.C.M) is the smallest number that is a
http://www.chacha.com/question/whatistheleastc...

The first three common multiples of the numbers 9 and 12 are. 36, 72 and 108. To determine the CM [common multiples] multiply out the factors of each given number. I hope this helps
http://answers.yahoo.com/question/index?qid=201109...

15, 30, 45
http://www.blurtit.com/q4753223.html
