五年级数学下册第2章校园艺术节—分数的意义和性质信息窗2分数与除法课件青岛版六三制.ppt

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1、从图中,你能知道哪些数学信息?,你能提出什么数学问题?,平均每幅画用多少米毛线?,平均每幅画用了多少个圆片?,平均每幅画用多少米毛线?,14 =,1米,1,4,(米),1,4,米,平均每幅画用了多少个圆片?,34 =,=,=,你从中发现了什么规律?,被除数,除数,=,a,b,a,b,=,(b0),4,1,3,4,1,4,3,4,(分子),(分母),被除数,除数,讨论:a和b可以为任意数吗?,=( )( ),( ),( ),在括号里填上合适的数。,3,5,7,8,12,7,35=,78=,12,7,( ),( ),小试牛刀,计算,继续,画图,你能把 化成带分数吗?,假分数,9,4,2,返回,你能

2、把 化成带分数吗?,假分数,= 9 4,把假分数化为带分数,可以这样计算:,9,4,= 9 4 =,1,4,2,返回,你能把 化成带分数吗?,假分数,想一想,怎样将假分数化成带分数?,把下面的假分数化成整数或带分数。,7,7,13,4,10,5,14,9,= 77 = 1,= 105 = 2,7,说一说,怎样将假分数化成整数或带分数?,小试牛刀,(1)把一条1米长的彩绳平均分成3份,每份长 米。,(2)把2条1米长的彩绳平均分成3份,每份是( )个 米,是 米。,1米,1米,1,3,1,2,3,3,2,1.,( ),2.在括号里填上合适的数。,=( )9,( ),( ),4( )=,2,( )

3、 ),( )( )=,9,2,7,4,7,9,9,10,10,8,8,1,2,1,2,2,3,3,2,4,3,4,3,.用分数表示各题的商,能化成带分数的要化成带分数。,2 9 =,8 11 =,30 19 =,13 8 =,.填一填。,1,( ),1=,=,=,2,( ),3,( ),其他的非零自然数也能化成分母是1、2、3 的假分数吗?,1,2,3,5.在 中,a是非0的自然数,当a 时,分数的值小于1;当a 时,分数的值等于1;当a 时,分数的值大于1;当a 时,分数能化为整数。,小于7,等于7,大于7,是7的倍数,这节课你有哪 些收获?,作业,请完成教材第13页自主练习,第7、8、9、10题。,xx小学 x年级x班,xxx,

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