of精品英文文档.ppt

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1、LO:ToFindfractionsofnumbersandquantities.4.5.05Whatishalfof……….58?Whatisaquarterof……….58?Whatisahalfof……….92?Whatisaquarterof……….92?Whatisahalfof……….144?Whatisaquarterof……….144?Whatstrategiesdidyouusetoanswerthesequestions?Arollofribbonis2m.IfIuse58cmofr

2、ibbon,whatfractionhaveIused?ShademorerectanglessothatexactlyhalfoftheshapeisshadedpleaseAcupholds250mlofliquid.Abottleholds500ml.Whatfractionofthebottledoesthecuphold?Acupholds250mlofliquid.Abottleholds500ml.Whatfractionofthebottledoesthecuphold?Whatfrac

3、tionofthecupdoesthebottlehold?LO:torelatefractionstodivisionandusedivisiontofindfractionsofnumbersandquantities.4.5.05Question:Wouldyouratherhave½abagofsweetsor6/10?Question:Wouldyouratherhave3/6abagofsweetsor1/2?½of501/3of1203/10of1002025303540455055LO:

4、Tousevocabularytoexpresssimpleratios.21.06.05Whatisthelengthofeachpartoftheribbon?Whatisthelengthofeachpartoftheribbon?Ifwecomparetheselengthstheyare50cmforevery50cm.Couldthisratiobesimplified?Ifwecomparetheselengthstheyare50cmforevery50cm.Couldthisratio

5、besimplified?1cmforevery1cm5cmforevery5cm,etc.25cmto75cm10cmto90cmLO:tofindsimplepercentagesofwholenumberquantities.Developcalculatorskillsanduseacalculatoreffectively.21.06.0550%£3601%25%240g10%4400km480ml69%of£360Canyouworkouttheanswerinyourhead?69%of

6、£360Canyouworkouttheanswerinyourhead?Whatmakesthiscalculationmoredifficult?87%£36029%36%240g58%4400km480ml87%£36029%36%240g58%4400km480mlRecordtheseasnumbersentencesinyourbook..i.e.17.5%of£360is£6317.5%LO:tofindsimplepercentagesofwholenumberquantities.In

7、eedanewpairoftrainers……Canyouhelpme,Ineedthebestvalue!ShopACost£30witha30%discountShopBCost£21witha12%discountShopCCost£24witha35%discountIneedanewpairoftrainers……Canyouhelpme,Ineedthebestvalue!ShopACost£30witha30%discountShopBCost£21witha12%discountShop

8、CCost£24witha35%discountWhichshophasthecheapesttrainers?Whathavewelearned?TocalculatekeypercentagesmentallyTouseacalculatortofindpercentages.LO:toFindsimplepercentagesofsmallwholenumberquantities.6/5/05404010%=4010%=20%401