Students fluently multiply multi-digit whole numbers using the standard algorithm and using estimation to check for reasonableness of the product.
Reasoning about zeroes in the multiplier, along with considerations about the reasonableness of products, also provides opportunities to deepen understanding of the standard algorithm.
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From EngageNY.org of the New York State Education Department. Grade 5 Mathematics Module 2, Topic B, Lesson 8.
Available from engageny.org/resource/grade-5-mathematics-module-2-topic-b-lesson-8; accessed 2015-05-29.
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