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lesson 9
1 hour

Making Ten When One Addend Is 8


Description

While encouraging students to use the most efficient strategy when solving number sentences, some may be able to use different number combinations as efficiently. For example, some might see 7 + 8 as 7 + 7 + 1 or 8 + 8 – 1, and some may already know 7 + 8 but benefit from the strategy discussion.

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Credits

From EngageNY.org of the New York State Education Department. Grade 1 Mathematics Module 2, Topic A, Lesson 9. Available from engageny.org/resource/grade-1-mathematics-module-2-topic-lesson-9; accessed 2015-05-29.
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