Least Common Multiple
LCM Part 1: Least Common Multiple-what it means, ways to find the LCM of a list of numbers. See part 2 and 3 for more methods.
http://www.youtube.com/watch?v=w_GwBDOSNp4
LCM Part 2: Shows a way to find the LCM of a list of numbers using a building approach from prime factorization of the numbers.
http://www.youtube.com/watch?v=EDjJkzH1A2Q
LCM Part 3: Shows a cool and easy way to find the LCM of two numbers.
http://www.youtube.com/watch?v=LKlWnSpc3bg