Here, in Topic F, students once again extend their understanding of multiplication to include scaling (5.NF.5). Students compare the product to the size of one factor, given the size of the other factor (5.NF.5a) without calculation (e.g., 486 × 1,327.45 is twice as large as 243 × 1,327.45 because 486 = 2 × 243). This reasoning, along with the other work of this module, sets the stage for students to reason about the size of products when quantities are multiplied by numbers larger than 1 and smaller than 1.
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From EngageNY.org of the New York State Education Department. Grade 5 Mathematics Module 4, Topic F Overview.
Available from engageny.org/resource/grade-5-mathematics-module-4-topic-f-overview; accessed 2015-05-29.
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