Students use fraction benchmark numbers to assess reasonableness of addition and subtraction equations. They use benchmark fractions and number sense of fractions to estimate mentally and assess the reasonableness of answers.
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From EngageNY.org of the New York State Education Department. Grade 5 Mathematics Module 3, Topic D, Lesson 13.
Available from engageny.org/resource/grade-5-mathematics-module-3-topic-d-lesson-13; accessed 2015-05-29.
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