七年级数学上册第四章数据的收集、整理与描述回顾与思考课件(新版)青岛版.ppt

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4 回顾与思考,第四章:数据的收集与简单统计图,通过本节课的学习,你对收集数据的方式有哪些了解?,复习:收集数据的方式,复习:整理数据的方法,通过本节课的学习,你对扇形统计图的画法有哪些了解?,复习:收集数据的方式,复习:画扇形统计图,二、计算,31.3%,19.5%,4.5%,复习:画扇形统计图,二、计算,36031.3=112.7,36019.4=69.8,3604.6=16.6,复习:画扇形统计图,复习:画扇形统计图,三、画图,复习:三种统计图的特点,条形统计图,扇形统计图,折线统计图,条形统计图能清楚地表示出每个项目的具体数目。,扇形统计图能清楚地表示出各部分在总体中所占的百分比.,折线统计图能清楚地反映事物的变化情况。,三 种 统 计 图 的 比 较,(1)三幅统计图分别表示了什么内容?(2)从哪幅统计图中你能看出世界人口的变化情况?(3)2050年非洲人口大约将达到多少亿?你是从哪幅统计图中得到这个数据的?,(4)2050年亚洲人口比其他各洲的人口总和还要多,你从哪幅统计图中可以明显地得到这个结论?(5)比较三种统计图的特点,并与同伴进行交流。,二、扇形统计图,复习:条形转扇形统计图,中国960万平方千米,复习:扇形转条形统计图,通过本节课的学习,你对统计图的转化方法有哪些了解?,制作条形统计图的步骤:1、求出总数;2、求出各部分数值;3、画出条形统计图。,

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