Investigating Population Changes

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How have the ages of three countries' populations changed from 1950 to 2020? And what problems might that create?

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Related CCSS Math Standards

Grade 2 2.MD.10 
Grade 3 3.MD.3 
Grade 4 4.MD.4 
Grade 5 5.G.2 
Grade 6 6.SP.4 6.SP.5 
Grade 7 7.RP.2 7.SP.1 7.SP.3 
Grade 8 8.F.5 8.SP.1