Combine fractions and measurement

~11 min

Use the same unit and same denominator before adding or subtracting fractional amounts.

Matching Denominators

3/8 shaded

To add or subtract fractions, the denominators must be the same so that the pieces you are counting have the same size. If the denominators are already the same, you just add or subtract the numerators while keeping the denominator the same.

💡 Think of denominators as labels for the size of the piece.