Students look for number relationships before calculating, for example, to use the associative property or partwhole understanding. Looking for relationships allows them to see shortcuts and connections that are so often bypassed in the rush to get the answer.
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From EngageNY.org of the New York State Education Department. Grade 5 Mathematics Module 3, Topic D, Lesson 14.
Available from engageny.org/resource/grade-5-mathematics-module-3-topic-d-lesson-14; accessed 2015-05-29.
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