For example the LCM of 4 and 6 is 12 because
Multiples of 4 are 4, 8, 12, 16, 20….
Multiples of 6 are 6, 12, 18, 24…
12 is the first number in both lists.
Practice finding Lowest Common Multiples with this Sporcle quiz. Challenge your friends to see who can get the best score.
You need to find the lowest common multiple when finding common denominators to add fractions. Highest common factors are also used in fraction or ratio calculations when you cancel down. This interactive worksheet will show you how to work them out.