三年级数学下册6.1《分一分(一)》课件3北师大版.ppt

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1、教学目标,1.结合具体情境和直观操作,初步理解分数意义,体会学习分数的必要性。 2.会用折纸、涂色等方式,表示简单的分数。,两个苹果,平均每人分一个,一个苹果,平均每人分半个,你用什么方式来表示一半呢?,1,一半可以用 表示。,想一想这里的涂色部分都是整个图形的 。,是,不是,是,不是,是,一张正方形的纸平均分成四份。,把其中一份涂上颜色,涂色部分是这张纸的( )。,把其中二份涂上颜色,涂色部分是这张纸的( )。,把其中三份涂上颜色,涂色 部分是这张纸的( ),把其中四份涂上颜色,涂色 部分是这张纸的( ),折一折(将正方形平均分成4份)。,折一折(将正方形平均分成4份)。,折一折(将正方形平

2、均分成4份)。,像 , , , 都 是分数 。,1,2,分子,分数线,分母,读作:二分之一,说一说:,将一段绳子平均分成3份,其中的一份,就叫三分之一。,将一个五角星平均分成5份,其中的三份,就叫五分之三。,将一个图形平均分成6份,其中的5份,就叫六分之五。,试着用分数表示下面各图的涂色部分,并读一读。,8,5,3,1,6,5,八分之五,三分之一,六分之五,用分数表示下面各图中的涂色 部分,并读一读。,按分数把下面各图涂上颜色。,左图中有,1.哪个图形的红色部分等于它的。,2.哪个图形的红色部分 大于它的 。,3.哪个图形的红色部分 小于它的 。,本课总结,知道分数各个部分的名称,会读写小数,能用分数表示物体的一部分和几部分。,

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