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Solve Fraction Addition/Subtraction Problems Practice Test
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Q1
Two students solved this problem about the same-sized whole pan of brownies: “A pan had $\tfrac{5}{6}$ of the brownies left. Then $\tfrac{1}{4}$ of the whole pan was eaten. How much of the pan is left now?” Fraction operations depend on understanding fraction size. Student 1 found a common denominator and subtracted. Student 2 subtracted $\tfrac{1}{4}$ from $\tfrac{5}{6}$ by subtracting both numerators and denominators to get $\tfrac{4}{2}$. Which explanation shows why the correct method works?
Two students solved this problem about the same-sized whole pan of brownies: “A pan had $\tfrac{5}{6}$ of the brownies left. Then $\tfrac{1}{4}$ of the whole pan was eaten. How much of the pan is left now?” Fraction operations depend on understanding fraction size. Student 1 found a common denominator and subtracted. Student 2 subtracted $\tfrac{1}{4}$ from $\tfrac{5}{6}$ by subtracting both numerators and denominators to get $\tfrac{4}{2}$. Which explanation shows why the correct method works?