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.

\(4 - 2\frac {1}{2}= 3\frac {2}{2} - 2\frac {1}{2}=1\frac {1}{2}\)

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