LCM(Otherwise known as "Least Common Multiple")

What if you had soccer practice every 3 days and you had music lessons every 5 days. When would you have both practices on the same day?You could find the Least Common Multiple of 3 and 5

Count by 3's and count by 5's and list them. Look for the smallest number that are on both lists

3: 3, 6, 9, 12, 15, 18, 21.....

5: 5, 10, 15, 20, .....

Every 15 days, you would have both practices

The ladder method is another way that is easier for some kids, so check out that video below:

Finding the LCM using the "ladder method"




Finding the LCM using the "list method"