教案-全国-2012_一年级数学下册 小兔请客 1教案 北师大版.rar

4用心爱心专心小兔请客教学课题：小兔请客LittleRabbit’streat教学目标：在实际情境中，进一步体会加减法的意义。能正确地进行整十数的加减法的计算。Tostrengthenkids’understandingofadditionandsubtractionEnablekidstocalculatecorrectly.教学重点：在实际情境中，进一步体会加减法的意义。Tostrengthenkids’understandingadditionandsubtraction.掌握整十数加减法的计算方法。Masterthemethodofdoingadditionandsubtraction.教学难点：能正确地进行整十数的加减法的计算。Doadditionandsubtractioncorrectly.课前准备：课件。courseware教学过程：Procedures:一、出示课题：小兔请客Presentthetitle:LittleRabbit’streat.请客要准备什么东西呢？Whatshouldweprepareforatreat?1.小兔准备了什么？（果子）Let’sseewhatLittleRabbithasprepared.小兔先拿出了几盘果子？（3盘）HowmanyplatesoffruitshasLittleRabbittakenoutatfirst?你知道这3盘一共有多少果子吗？（小猴说：“每盘10个果子”，3盘就有3个十，就是30个。）Doyouknowhowmanyfruitsthereareinthese3plates?(LittleMonkeysays:Thereare10ineachplate.Sothereare30inthreeplates.)小兔又拿出了多少个果子？HowmanymorefruitdoesLittleRabbittakeout?你想提什么问题？（一共有多少个果子？）Whatquestiondoyouwantask?(Howmanyfruitistherealltogether?怎样解答？你会写算式吗？Howtoworkitout?Canyouwritethecalculation?用小棒代替果子摆一摆。Usethesesmallsticksasfruits,placetherightnumber.（先摆3个十，再摆2个十，一共是几个十？）(First,place3groupsofsticks,Eachgrouphastensticks.Then2groupswith10sticksineach.Howmanytensdowehavealltogether?)2.看看发生了什么事？（小刺猬拿走了一盘果子。）Let’sseewhathappened?(Littlehedgehogtakesawayaplateoffruit.)你想提什么问题？（还剩下多少个果子？）Whatkindofquestiondoyouwanttoask?(Howmanyfruitleftthere?)怎样解答？你会写算式吗？Howtoworkout?Canyouwritethecalculation?用小棒代替果子摆一摆。Usethesesmallsticksasfruits,placetherightnumber.（先摆5个十，拿走1个十，还剩下几个十？）First,place5ten.Take1tenaway,howmanytenleftthere?这两个算式有什么特点？（每个数都是整十数）What’sthecharacteristicofthese2calculations?这样的加减法会做吗？Canyoudothiskindofadditionandsubtraction?二、练一练：Practice:1.看图，你看到了什么？你想提什么问题？Lookatthepicture,whatdoyouseeinthepicture?Whatquestiondoyouwanttoask?（桌子上有40根小棒，女孩子又拿来20根，一共有多少根小棒？）Thereare40sticksonthetable.Thegirlbringsanother20,howmanysticksaretherenow?（桌子上原来有60根小棒，男孩子拿走了20根，还剩多少根小棒？）Thereare60sticksonthetable,theboytakesaway20sticks,howmanyleft?2.自己算一算Doitbyyourself.3.母鸡在找自己的孩子，请你帮帮它们，连线。Thehenislook