Adding and Subtracting Fractions

Same Denominator

If the denominators are the same, add or subtract the numerators.

Example:

1/5 + 2/5

5/7 − 2/7

Different Denominators

If the denominators are different, make them the same.

Use LCM to find a common denominator.

Example:

1/2 + 1/3

3/4 − 1/6

Simplifying Fractions

Use GCD to simplify fractions.

Example:

6/8 = 3/4