Lesson plan

Understand subtraction as adding the additive inverse by modeling with number lines

teaches Common Core State Standards CCSS.Math.Content.7.NS.A.1c http://corestandards.org/Math/Content/7/NS/A/1/c
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4

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