Subtract fractions from fractions less than 2 with unlike denominators.
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For some problems in this lesson, students may use a computation-specific strategy. For example, students might think of a computation as an unknown-addend problem and use an addition strategy to solve (including the mental strategy of making a whole, e.g., to solve $$1\frac{3}{5}-\frac{7}{8}=1\frac{24}{40}-\frac{35}{40}$$, a student might add $$\frac{35}{40}+\frac{5}{40}=1$$ and $$1+\frac{24}{40}=1\frac{24}{40}$$, so the difference is $$\frac{5}{40}+\frac{24}{40}=\frac{29}{40}$$). Students might also use a mental strategy like going down over a whole (e.g., $$1\frac{24}{40}-\frac{24}{40}-\frac{11}{40}=1-\frac{11}{40}=\frac{29}{40}$$). Discussing various strategies and their advantages and disadvantages “provide opportunities for students to compare approaches and justify steps in their computations (MP.3)” (NF Progression, p. 13).
If you need to adapt or shorten this lesson for remote learning, we suggest prioritizing Anchor Task 3 (benefits from worked example). Find more guidance on adapting our math curriculum for remote learning here.
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a. $$1\frac{2}{3}-\frac{1}{2}$$
b. $$1\frac{1}{2}-\frac{2}{3}$$
$${1{4\over5}-{5\over6}}$$
a. $$1\frac{3}{5}-\frac{7}{8}$$
b. $$1\frac{2}{3}-\frac{5}{6}$$
c. $$1\frac{5}{8}-\frac{5}{12}$$
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Solve. Show or explain your work.
$${1{1\over6}-{1\over4}}$$
Solve. Show or explain your work.
Tara baked $$1\frac{1}{2}$$ dozen cookies. She sold $$\frac{2}{3}$$ dozen of the cookies she made. How many dozens of cookies does Tara have remaining?
From EngageNY.org of the New York State Education Department. New York State Testing Program Grade 5 Common Core Mathematics Test Released Questions June 2017. Internet. Available from https://www.engageny.org/resource/released-2017-3-8-ela-and-mathematics-state-test-questions/file/150271; accessed Dec. 5, 2017, 3:55 p.m..
Modified by Fishtank Learning, Inc.With Fishtank Plus you can access our Daily Word Problem Practice and our content-aligned Fluency Activities created to help students strengthen their application and fluency skills.
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