Students identify the scale factor in order to make intuitive comparisons of size and then devise a strategy for finding actual lengths using the scale.
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From EngageNY.org of the New York State Education Department. Grade 7 Mathematics Module 1, Topic D, Lesson 18.
Available from engageny.org/resource/grade-7-mathematics-module-1-topic-d-lesson-18; accessed 2015-05-29.
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