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1、RatiosandRatesNumberMathematicsinContextisacomprehensivecurriculumforthemiddlegrades.Itwasdevelopedin1991through1997incollaborationwiththeWisconsinCenterforEducationResearch,SchoolofEducation,UniversityofWisconsin-MadisonandtheFreudenthalInstituteattheUniversityofUtrecht,TheNetherlands,witht
2、hesupportoftheNationalScienceFoundationGrantNo.9054928.Therevisionofthecurriculumwascarriedoutin2003through2005,withthesupportoftheNationalScienceFoundationGrantNo.ESI0137414.NationalScienceFoundationOpinionsexpressedarethoseoftheauthorsandnotnecessarilythoseoftheFoundation.Keijzer,R.,Abels,
3、M.,Wijers,M.,Brinker,L.J.,Shew,J.A.,Cole,B.R.,andPligge,M.A.(2006).Ratiosandrates.InWisconsinCenterforEducationResearch&FreudenthalInstitute(Eds.),MathematicsinContext.Chicago:EncyclopædiaBritannica,Inc.Copyright©2006EncyclopædiaBritannica,Inc.Allrightsreserved.PrintedintheUnitedStatesofAmer
4、ica.ThisworkisprotectedundercurrentU.S.copyrightlaws,andtheperformance,display,andotherapplicableusesofitaregovernedbythoselaws.AnyusesnotinconformitywiththeU.S.copyrightstatuteareprohibitedwithoutourexpresswrittenpermission,includingbutnotlimitedtoduplication,adaptation,andtransmissionbytel
5、evisionorotherdevicesorprocesses.Formoreinformationregardingalicense,writeEncyclopædiaBritannica,Inc.,331NorthLaSalleStreet,Chicago,Illinois60610.ISBN0-03-039629-82345607309080706TheMathematicsinContextDevelopmentTeamDevelopment1991–1997TheinitialversionofRatiosandRateswasdevelopedbyRonaldKe
6、ijzerandMiekeAbels.ItwasadaptedforuseinAmericanschoolsbyLauraJ.Brinker,JuliaA.Shew,andBethR.Cole.WisconsinCenterforEducationFreudenthalInstituteStaffResearchStaffThomasA.RombergJoanDanielsPedroJandeLangeDirectorAssistanttotheDirectorDirectorGailBurrillMargaretR.MeyerElsFeijsMartinvanReeuwijk
7、CoordinatorCoordinatorCoordinatorCoordinatorProjectStaffJonathanBrendefurSherianFosterMiekeAbelsJansieNiehausLauraBrinkerJamesA,MiddletonNinaBoswinkelNandaQuerelleJamesBrowneJasminaMilinkovicFransvanGalenAntonRoodhardtJackBurrillMargaretA.PliggeKoe
