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,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,LOGO,COMPANY LOGOTYPE INSERT,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,LOGO,COMPANY LOGOTYPE INSERT,*,除数是一位数的除法,口算除法,8,4=,35,5=,9,3=,40,2=,24,6=,500,6,=,2,3,4,7,80,3000,复 习,60,里面有()个十。,6,500,里面有()个百。,240,里面有()个十。,100,里面有()个十。,5,24,10,问题,1,:图中是什么地方?从图中你可以获得哪些数学信息?,问题,2,:根据我们获得的数学信息你能提出什么问题?,我,3,次就能运完这,60,箱,你呢?,这些我也运,3,次。,我们一次运完这些。,这么多我也只运,3,次。,赵伯伯平均每次运多少箱黄瓜?,王叔叔平均每次运多少箱西红柿?,李阿姨平均每次,运多少箱辣椒?,李叔叔他们三人平均每人,大约运多少箱茄子?,(,1,)赵伯伯平均每次运多少箱黄瓜?,我,3,次就能运完这,60,箱,,60 3 =,答:赵伯伯每次运,20,箱黄瓜。,20,(箱),想:,6,个十除以,3,等于,2,个十,,2,个十是,20.,把,60,平均分成,3,份,每份是,20,。,因为,63=2,所以,603=20,因为,203=60,所以,603=20,603=,20,想:,6,个十,3=2,个十,=20,小结:,整十数除以一位数,可以把整十数看成,几个十,计算出来的结果就是多少个十。,“,603”,可以读作,“,60,除以,3,”,,,也可以读作:,“,3,除,60,”,。,想一想:,6003,可以怎样算?得多少?,60003,得多少?,想:,6,个百,3=2,个百,=200,=200,想:,6,个千,3=2,个千,=2000,=2000,(,2,)王叔叔平均每次运多少箱西红柿?,这么多我也只运,3,次。,600 3 =,200,(箱),答:王叔叔平均每次运,200,箱西红柿,.,想:,6,个百除以,3,等于,2,个百,,2,个百是,200.,小结:,整百数除以一位数,可以把整百数看成,几个百,计算出来的结果就是多少个百。,口算。,402=,5005=,80002=,20,100,4000,80,800,8000,2,40,400,4000,算一算、比一比。,90,900,9000,3,30,300,3000,算一算、比一比。,下面的计算对吗?,9003,31,202=10,80004,200,7007,100,30 3 =,400 2=,10,200,抢 答:,9000 3 =,3000,(3),李阿姨平均每次运多少箱辣椒,?,240,是,24,个十,,24,个十除以,3,等于,8,个十,,2403,80,小红,小军,380=240,2403=80,240 3 =,80(,箱),答:李阿姨平均每次运,80,箱辣椒。,这些我也运,3,次。,想:,24,个十除以,3,等于,8,个十,,8,个十是,80.,小结:,一位数除几百几十的数的口算方法:把几百几十看成几个十,,再除以一位数,得到的商是几个十,就是几十。,猜一猜,2400 3 =,800,12006,200,15003,500,整十、整百、整千的数,除以,一位数的口算方法是:,把被除数看成是几个十、几个百、几个千,再除以一,位数。,知识归纳,本节课的内容,你学会了吗?,几百几十,除以,一位数的口算方法是:,把几百几十看成是几十几个十,再除以一位数。,购物中的数学。,新学期,学校购买办公用品。,购买了,8,箱粉笔,共用,240,元。每箱()元。,购买了,6,把椅子,用,540,元。每把椅子()元。,购买了,4,组柜子,用,800,元。每组柜子()元。,购买了,2,台电脑,用,10000,元。每台电脑()元。,30,90,200,5000,1802,182,18002,900,90,9,4005,405,40005,800,80,1.神奇的宝塔,8,2408,36006,600,30,3003,80004,402,603,小兔子回家。,20,20,100,2000,90 3 =,(),80 2 =,(),900 3 =,(),800 2 =,(),15 5 =,(),270 9 =,(),150 5 =,(),2700 9 =,(),口算,30,40,300,400,3,30,30,300,做一做,40 2=20,(只),平均每间蜂房住多少只?,答:平均每间蜂房住,20,只。,(,1,),一年级有,240,个同学参加托管课,平均分成,6,个班,每个班有多少个同学?,解决问题,(,2,),三年级,7,个班参加植树活动,共植树,280,棵,平均每个班植树多少棵?,240 6 =,280 7=,答:每个班有,40,个同学。,40,(个),答:平均每个班植树,40,棵。,40,(棵),作业:,2,月,24,日(星期一),80 4 =,90 3 =,60 6 =,9000 3 =,630 9 =,600 2 =,280 4 =,800 4 =,1200 6 =,40 2 =,7000 7 =,200 4 =,1.,算一算,2.,列式计算,(,2,),6,除,180,得多少?,(,1,),40,除以,4,得多少?,(,3,)把,450,平均分成,9,份,每份是多少,?,3.,小影每天早晨在运动场跑,4,圈,共跑,1600,米,这个运动场一圈多少米?,做一做,平均每筐大约装多少个?,可以把,260,看作,240,。,也可以把,260,看作,280,。,240 4=60,(个),280 4=70,(个),思维训练,今天你收获了什么?,谢 谢,
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