Description
Students practice and apply the algorithm within the context of word problems and assess the reasonableness of their answers using rounding (4.OA.3). When using tape diagrams to model word problems, students use a variable to represent the unknown quantity.
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Credits
From EngageNY.org of the New York State Education Department. Grade 4 Mathematics Module 1, Topic D, Lesson 12.
Available from engageny.org/resource/grade-4-mathematics-module-1-topic-d-lesson-12; accessed 2015-05-29.
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