Lisa needs \(\frac{4}{5}\) pound of shrimp to make shrimp salad. She has \(\frac{1}{5}\) pound of shrimp. How much more shrimp does Lisa need to make the salad?

Subtract \(\frac{4}{5}-\frac{1}{5}\). Use the model to help.

Shade the model to show how much shrimp Lisa needs.
Then shade the model to show how much shrimp Lisa has.
Compare the difference between the two shaded rows.

\(\frac{4}{5}-\frac{1}{5}=\frac{\blacksquare}{5}\)

Lisa needs _____ pound more shrimp.

\(\frac{3}{6} - \frac{2}{6}=\frac{\blacksquare}{6}\)

\(\frac{8}{10} - \frac{3}{10}=\frac{\blacksquare}{10}\)

Explain how you could find the unknown addend in

\(\frac{2}{6}\) + _____ = 1 without using a model.