Description
Students use a letter to represent the unknown in various positions within multiplication and division problems, introducing the abstraction of using letters as placeholders.
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From EngageNY.org of the New York State Education Department. Grade 3 Mathematics Module 3, Topic A, Lesson 3.
Available from engageny.org/resource/grade-3-mathematics-module-3-topic-lesson-3; accessed 2015-05-29.
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