In Lessons 2 and 3, students use their understanding of the area and perimeter formulas to solve multiplicative comparison problems including the language of times as much as with a focus on problems using area and perimeter as a context (e.g., A field is 9 feet wide. It is 4 times as long as it is wide. What is the perimeter of the field?) (4.OA.2, 4.MD.3). Students create diagrams to represent these problems as well as write equations with symbols for the unknown quantities.
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From EngageNY.org of the New York State Education Department. Grade 4 Mathematics Module 3, Topic A, Lesson 2.
Available from engageny.org/resource/grade-4-mathematics-module-3-topic-lesson-2; accessed 2015-05-29.
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