9 twelfth-size parts − 5 twelfth-size parts =

Christopher mixes \(\frac{3}{8}\) gallon of red paint with \(\frac{5}{8}\) gallon of blue paint to make purple paint. He uses \(\frac{2}{8}\) gallon of the purple paint. How much purple paint is left?

A city worker is painting a stripe down the center of Main Street. Main Street is \(\frac{8}{10}\) mile long. The worker painted \(\frac{4}{10}\) mile of the street. Explain how to find what part of a mile is left to paint.

Sense or Nonsense? Brian says that when you add or subtract fractions with the same denominator, you can add or subtract the numerators and keep the same denominator. Is Brian correct? Explain.

The length of a rope was \(\frac{6}{8}\) yard. Jeff cut the rope into 3 pieces. Each piece is a different length measured in eighths of a yard. What is the length of each piece of rope?

For 18a–18d, choose Yes or No to show if the sum or difference is correct.

a. \(\frac{3}{5} + \frac{1}{5}=\frac{4}{5}\)

b. \(\frac{1}{4} + \frac{2}{4}=\frac{3}{8}\)

c. \(\frac{5}{8} - \frac{4}{8}=\frac{1}{8}\)

d. \(\frac{4}{9} - \frac{2}{9}=\frac{6}{9}\)