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      欢迎来到原中小学教育资源网!

      《扇形统计图》教案课件

      课件 时间:2017-06-23 我要投稿
      【www.dnfdy.com - 课件】

        引导学生了解扇形统计图的特点、意义、作用;会看扇形统计图,会制作扇形统计图,会分析。下面瑞文网小编为大家整理了《扇形统计图》教案课件。

        教学目标

        1、通过实例,认识扇形统计图,了解扇形统计图的特点与作用。

        2、能读懂扇形统计图,从中获取有效信息,体会统计在现实生活中的作用。

        教学重点

        通过实例,认识扇形统计图,了解扇形统计图的特点与作用。

        教学难点

        能读懂扇形统计图,从中获取有效信息,体会统计在现实生活中的作用。

        教学过程

        一、谈话导入新课

        师:课前袁老师让大家收集生活中的一些统计图,我们一起来看看同学们都收集了哪些?(展示学生作业,请学生介绍自己收集的统计图。)

        教师适机提问:这样的统计图有什么特点呢?

        生:条形统计图可以清楚的看出数量的多少,折线统计图不仅可以看出数量的多少还可以看出数量的增减变化情况。

        师:说的不错。现在老师要考考大家会不会用。下星期我们学校将举行秋季运动会,如果我们绘制一幅统计图,要能清楚的反映同学们喜欢各项体育运动的人数,你们认为应该绘制什么样的统计图比较合适呢?

        生:条形统计图。

        师:嗯,不错!条形统计图可以清楚的反映出数量的多少。如果我想绘制一幅统计图来表示今天24个小时的气温变化情况,用什么统计图合适呢?

        生:折线统计图。

        师:嗯,老师也同意,折线统计图不仅可以看出数量的多少还可以看出数量的增减变化情况。

        老师还发现有同学找了这样一些图,我们来看看。(对收集这些图的学生提问)你能给大家说说你找的是什么图?

        学生回答。

        师:这样的图也是统计图?那今天我们就来认识认识它,一种新的统计图。

        师板书:扇形统计图

        师:从这个题目中,你想学到哪些知识?

        预设:(1)扇形统计图有哪些特点?(2)什么叫扇形统计图?

        (3)怎样作扇形统计图?(4)扇形统计图有什么作用?

        二、合作交流,探究新知

        1、说一说

        师:同学们真好学,想知道的可真多啊!那我们就从我国居民平衡膳食宝塔图开始来了解吧。(课件出示)听了关于我国居民平衡膳食宝塔图的介绍,同学们能不能从这个宝塔图中知道我们需要的哪种食物最多?其次呢?接着呢?

        看了这幅图,你对同学们的饮食有什么建议呢?

        师:是呀,膳食宝塔图各层位置和面积的不同反映出各类食物在膳食中的地位和应占的比重。这说明了我们要注意健康饮食。接下来我想请同学们看看笑笑她们家的饮食情况。

        课件出示笑笑家一天各类食物的摄入量统计表

        师:请同学们读一读统计表,在小组里互相说一说表中百分数的意思。

        (学生交流完后,教学利用随机点名请几位学生说一说各百分数的意思)

        师:表格中的总摄入量是指什么?100%是什么意思?

        通过大家对这些百分数的解释,那笑笑家一天各类食物的摄入量是否符合膳食宝塔图的结构呢?

        2、引导讨论。

        师:大家看,袁老师根据刚才的统计表中是数据重新绘制了一个图,你能看懂吗?

        请同学们先仔细观察,你看懂了什么。

        根据老师的温馨提示单想一想,在小组里交流交流。

        (1)根据数据将圆分成了几部分?每个部分像什么形状?图中的各个扇形分别代表了什么?

        (2)在这个扇形统计图中,用整个圆表示什么?所有的百分数之和是多少?能对应的上统计表中的总摄入量为100%吗?

        师:现在把你们小组交流的学习成果和大家一起分享吧。

        3、了解特点。

        师:同学们对这幅扇形统计图分析的很透彻,想一想,我们能从中获得哪些信息?

        师:能不能用条形统计图来表示笑笑家一天食物的摄入量呢?为什么?(条形统计图只能表示出各类食物的摄入量是多少,不能表示出各类食物的摄入量与总摄入量之间的关系,这也是条形统计图所没有的功能,而扇形统计图可以。)

        扇形统计图有什么特点?小组先讨论一下,然后汇报。

        老师小结:

        (1)扇形统计图能够直观地表示整体与部分之间的关系。(直观表现在哪里?---扇形表示部分,圆表示整体)也就是能清楚地看到各类食物的摄入量占总摄入量的百分比。

        三、巩固练习,提升反馈

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