topic E
3 hours
Mental Strategies For Multi-Digit Whole Number Division
Math Grade 5 Curriculum Map
Description
Topic E begins concretely with place value disks as an introduction to division with multi-digit whole numbers (5.NBT.6).
In the same lesson, 420 ÷ 60 is interpreted as 420 ÷ 10 ÷ 6. Next, students round dividends and two-digit divisors to nearby multiples of 10 in order to estimate single-digit quotients (e.g., 431 ÷ 58 ≈ 420 ÷ 60 = 7) and then multi-digit quotients. This work is done horizontally, outside the context of the written vertical method.
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Credits
From EngageNY.org of the New York State Education Department. Grade 5 Mathematics Module 2, Topic E Overview.
Available from engageny.org/resource/grade-5-mathematics-module-2-topic-e-overview; accessed 2015-05-29.
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