五年级数学下册5.2《分数除法(二)》课件3北师大版.ppt

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1、分数除法(二),填一填,说一说。,4张同样大的饼,,每2张一份,可以分成几份?,每1张一份,可以分成几份?,42 ( ),4 ( ),4 ( ),4 ( ),2 份,4 份,1,2份,4个2,8份,2份,2份,2份, 428(份),3份,3份,3份,3份,4个3,12份, 4312(份),=45=20,=44=16,1,2,3,4,3,3,3,3,23,3,3,3,33,3,3,3,3,43,3,13,13,你能看懂吗?,算一算,说一说进行分数除法计算时要注意些什么。,1,2,1.有一根长2m的绳子。,截成每段长 m,可以截成几段?,截成每段长 m,可以截成几段?,截成每段长 m,可以截成几段

2、2,( ),2,( ),2,( ),2段,2段,224,236,3段,3段,1段,1段,1段,2.你能解释“除以一个不为零的数等于乘这个数的倒数”的理由吗?与同伴说一说。,3.,计算下列各题,把得数大于6的算式圈起来,你发现了什么?与同伴交流。,除数小于1,商比被除数大。,除数等于1,商等于被除数。,除数大于1,商比被除数小。,在 里填上“”“”或“”,说一说你是怎么想的。,4.想一想,把得数小于5的算式圈起来。,5.在 里填上“”“”或“”。,6.分一分,算一算。 1袋20kg的大米,每天吃掉 kg,可以吃多少天? 修一条长12km的公路,如果每天修 km,多少天可以修完?,7.,22,36,13,4,8.解方程。,9.一壶水可以倒几杯?,10.算一算,结合下图说一说。,2,4,8,通过今天的学习,你有什么收获?,

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