Description
Students choose and explain solution strategies and record with a written addition or subtraction method. Students then discuss and analyze their chosen methods and decide which method is most efficient for the given problem type.
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Credits
From EngageNY.org of the New York State Education Department. Grade 2 Mathematics Module 5, Topic D, Lesson 19.
Available from engageny.org/resource/grade-2-mathematics-module-5-topic-d-lesson-19; accessed 2015-05-29.
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