- 1). Add the numerators of your fractions (if you are performing and addition calculation). Thus 5/12 + 2/12 = 7/12.
- 2). Subtract the numerators of your fractions (if you are performing a subtraction calculation). Thus 5/12 - 2/12 = 3/12.
- 3). Validate the addition of fractions by subtracting one of the original values from the final sum. You should have the other original value as a result. Here, 7/12 - 5/12 = 2/12. Thus, the calculation is correct.
- 4). Validate the subtraction of fractions by adding one of the original values from the final sum. Again, you should have the other original value as a result. For the subtraction example used, 3/12 + 2/12 = 5/12. Your subtraction is correct.
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