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Sep 262015

LCMsThe Lowest Common Multiple (LCM) is the smallest positive number that is a multiple of two or more numbers.

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.


Sep 292013

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.