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

teaches
Common Core State Standards
CCSS.Math.Practice.MP4
http://corestandards.org/Math/Practice/MP4

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