Place value charts and disks (both concrete and pictorial representations) and the relationship between addition and subtraction are used to provide a bridge for relating such understandings to a written method.
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From EngageNY.org of the New York State Education Department. Grade 5 Mathematics Module 1, Topic D, Lesson 9.
Available from engageny.org/resource/grade-5-mathematics-module-1-topic-d-lesson-9; accessed 2015-05-29.
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