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teaches
Common Core State Standards
CCSS.Math.Content.7.G.B.4
http://corestandards.org/Math/Content/7/G/B/4

teaches
Common Core State Standards
CCSS.Math.Practice.MP7
http://corestandards.org/Math/Practice/MP7

teaches
Common Core State Standards
CCSS.Math.Practice.MP8
http://corestandards.org/Math/Practice/MP8