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三年级数学下册六《认识分数》吃西瓜课堂作业北师大版.doc

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1吃 西 瓜备选例题一张饼，小明吃了这张饼的 81，哥哥吃了这张饼的 82，他们一共吃了这张饼的几分之几？还剩下这张饼的几分之几？解析求一共吃了这张饼的几分之几，列式为 1 ，求剩下这张饼的几分之几，用整体“1”减去已经吃的 83。备选习题1看图计算并涂一涂。2小猴吃冬瓜。昨天吃了这个冬瓜的 84，今天又吃了这个冬瓜的 83。请你帮小猴算一算：(1)两天一共吃了这个冬瓜的几分之几？(2)今天比昨天少吃了这个冬瓜的几分之几？答案2

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