3 What is the least common multiple of 5 and 10 ? A 1 B 5 D 50

The least common multiple (LCM) of two numbers is the smallest multiple that both numbers share. In the case of 5 and 10, the multiples of 5 include 5, 10, 15, 20, and so on, while the multiples of 10 are 10, 20, 30, etc. The smallest number that appears in both lists is 10, making it the LCM of 5 and 10! If you ever feel stuck finding the LCM, a good rule of thumb is to list the multiples of each number until you spot the first common one. But watch out for skipping numbers! It’s easy to jump ahead and miss the obvious answer lurking right there in the list. So take your time and check your work!