Students manipulate arrays to study the commutative property. They rotate arrays 90 degrees, distinguishing rows from columns, noticing that the meaning of factors changes based upon orientation.
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From EngageNY.org of the New York State Education Department. Grade 3 Mathematics Module 1, Topic C, Lesson 7.
Available from engageny.org/resource/grade-3-mathematics-module-1-topic-c-lesson-7; accessed 2015-05-29.
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