Lesson plan

Add within 20 by decomposing to make 10

teaches Common Core State Standards CCSS.Math.Content.2.OA.B.2 http://corestandards.org/Math/Content/2/OA/B/2
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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