两步计算的应用题(课件).ppt

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1、Accordingtothesupplementaryconditionsclass(1)gradetwohas20boys,18girl.20boys18girlsThereare36peopleonthecar,gotostationtodescend8people.36people8people----------->mymotherbought12Apple,______.Howmanyleft?Xiaomingtaptheball50times,______.HowmanytimesdidXiao-MingandXiao-Gangtap?Thereare24

2、ballsinthestoreandsell20,howmanyleft?24—20=4A:4left.Saythisalreadyknow,beggingofiswhat,whydoesthisuseasubtractioncalculationthereare6footballand18basketballinthestoreandsell20,howmanyleft?1.Readingtitle.2.Lookforknown,unknown3.Analysisoftherelationshipbetweenthenumber.618①thetotalnumberof

3、storesaball?6+18=24(a)6+18=24(a)obtainedwhat?②howmanyleft?24-20=4(a)24-20=4(a)obtainedinreturn?(1)readtitle.(2)lookforknown,unknown.(3)analysisoftherelationshipbetweenthenumber.(4)thecorrectanswer.DoityourselfTheclassmatesdid20kites,theteacherdid8kites.send25tokidsintheKindergartenhowmany

4、kitesstillremain?20+8=28(a)28-25=3(a)A:remain3kite.(1)schoolhas14boxesofchalk,thenboughtanother30boxes,howisthenumberofboxesofchalk?(2)Originallythereis40boxesofchalksinschool,useto26boxes.thenbuy30boxesagain,howmanyboxesofchalkdotheshcoolhavenow?Homework1.Thereare36passengersinacarandg

5、otonewstreetstationtodescendto8people.comeup12peopleagain,atthistimehowmanypersonsarethereonthecar?2.onestorehas40blueschoolbags,30greenschoolbags.sell37,howmanyremain?Classover０３双语（１）俞澄