To find the least common multiple of two numbers, I need to find the smallest positive integer that is a multiple of both numbers. One way to do this is to list the multiples of each number until I find one that is common to both lists. For 72, the multiples are 72, 144, 216, 288, ... For 96, the multiples are 96, 192, 288, ... I see that 288 is the first common multiple in both lists, so it is the least common multiple of 72 and 96. 
What is the least common multiple of 72 and 96?