Lesson plan

6. Solve problems with unknown angle measurements using addition and subtraction (A)

teaches Common Core State Standards CCSS.Math.Content.4.MD.C.5a http://corestandards.org/Math/Content/4/MD/C/5/a
teaches Common Core State Standards CCSS.Math.Content.4.MD.C.7 http://corestandards.org/Math/Content/4/MD/C/7
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1

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