# For his oyster stew, Fred uses $$1\frac {1}{4}$$quarts of regular milk. Fred is making a double recipe. How many quarts of milk will Fred have left from his full gallon carton if there are 4 quarts to a gallon?

$$1\frac {1}{2}$$

Explanation

Multiply $$1\frac {1}{4}$$by 2 to find how many quarts of milk he needs for the double recipe.
$$2 \times 1\frac {1}{4} = 2 \times \frac {5}{4} = 1 \times \frac {5}{2} = \frac {5}{2} = 2\frac {1}{2} \text {quarts}$$
He started with 4 quarts in his gallon carton. So subtract 21/2 quarts from 4 quarts to find how many quarts of milk he has left.

$$4 - 2\frac {1}{2}= 3\frac {2}{2} - 2\frac {1}{2}=1\frac {1}{2}$$