Students use rulers alongside the array, discovering the side length is equal to the number of tiles required to cover one side of the rectangle.
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From EngageNY.org of the New York State Education Department. Grade 3 Mathematics Module 4, Topic A, Lesson 4.
Available from engageny.org/resource/grade-3-mathematics-module-4-topic-lesson-4; accessed 2015-05-29.
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