• To add or subtract two fractions, we make the denominators equal using the least common multiple, then add or subtract the numerators and keep the common denominator.
• For example:

2/3 + 3/4 = 8/12 + 9/12 = 17/12

5/6 − 1/4 = 10/12 − 3/12 = 7/12

1. When adding a negative rational number
2. we apply the same rules as for integers to the numerators.