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New! - Multiplication game - catch the hodag!


Adding and subtracting with negatives activity


Factoring Game


This page shows the usual method of finding the common denominator using the least common multiple. To see an easier method, click here.

How to solve:
Problem: (16) + (310)
1a. List multiples of the first denominator: 6, 12, 18, 24, 30, 36, ...
1b. List multiples of the second denominator: 10, 20, 30, 40, 50, 60, ...
1c. The common denominator is the least common multiple:
(the first number that is in both lists)
6, 12, 18, 24, 30, 36
10, 20, 30, 40, 50, 60
2. Convert the first fraction to a fraction having the common denominator: 16 = 16 * 55 = 530
3. Convert the second fraction to a fraction having the common denominator: 310 = 310 * 33 = 930
4. Add: 530 + 930 = 1430.

Here's one to try:

      





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(Starts timer)
     




              





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