Description
Students model commutativity using both arrays and tape diagrams. They reflect upon the equality of both strategies.
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From EngageNY.org of the New York State Education Department. Grade 3 Mathematics Module 1, Topic E, Lesson 15.
Available from engageny.org/resource/grade-3-mathematics-module-1-topic-e-lesson-15; accessed 2015-05-29.
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