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教学设计:认识条形统计图

  发布者:张小华    所属单位:金鼎山镇中心学校    发布时间:2018-02-26    浏览数( -) 【举报】

条形统计图                    

1课时  1格表示1个单位的条形统计图

 执教   张小华

教学内容:

1格表示1个单位的条形统计图 P94—P95

教学目标

1、经历用数字、图形和条形来表示数量的不同方式的对比过程,体验条形表示数量多少时更直观、便于比较的优势,体会学校条形统计图的必要性。

通过读图、画图活动认识1格表示1个格单位的条形统计图,了解条形统计图的结构特征和表示数量的方法,能对数据做简单的分析。,能根据要求准确的画出长短合适的条形。 
    3、培养学生良好的观察、思考问题的习惯,提高用数学知识解决数学问题的能力。
教学重难点                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
    重点: 理解1格表示1个单位的条形统计图。
    难点: 了解条形统计图的特点并根据数据大小准确地画出长短合适的条形统计图。
教学准备
    课件、直尺
教学过程
   (一)导入新授
    1、课件出示20179遵义市的天气情况图:引导学生认识和了解图例中表示天气的各种图形。 
    2、师生交流后,提出问题:这个月的各种天气各有多少天?你能把它们清楚地表示出来吗?
   (二)探索发现
    1、初步认识条形统计图。 
   1)整理数据
    师:你怎样才能知道这个月每种天气各有多少天呢? 
    启发学生思考并整理数据:我们要统计什么?用什么方法可以统计出这些数据呢? 
    学生在交流的基础上,知道可以分别用数数、画“√”、画“○”、写“正”字等方法。 
    学生小组合作活动,教师巡视指导。 
    组织学生汇报交流:你们小组是用什么方法收集数据的?为什么选用这个方法? 
     在学生交流的基础上认识到用写“正”字法来进行统计,比较方便。 
    2)表示数据。 
     师:我们通过画“正”字法来进行统计,已经知道了每组天气各有多少天了,那如何才能清楚的表示出来呢? 
     组织学生小组讨论,并在小组内完成。 汇报展示。

3)分析数据。 
师:刚才这几组同学把数据都表示清楚了吗?后面的两种方法哪种表示得更清楚? 
     组织学生在小组内交流讨论。 
汇报时明确:这三种方法都能表示出2017年9月遵义市的天气情况,但是条形统计图能更好地表示出各种数量的多少。 
    4)小结 
    像这样用用条形的长短来表示数量多少的统计图,我们把它叫做条形统计图。(板书课题) 
仔细观察条形统计统计图,除了表示数据的条形外,从图中还能看到什么? 
    小结:条形统计图一般是由标题、制图日期(指画统计图的时间)、单位名称、条形、横轴(要统计的内容)、纵轴(一般表示数量)等组成。 
    5)比较统计表和统计图 
    小结:可以清楚的看出数量的多少,方便比较分析。 
(三)巩固发散
     1、P95  做一做
(四)评价反馈
     说一说你有什么收获。
(五)板书设计 
     条形统计图(一)
用条形的长短莱表示数量多少的统计图,叫条形统计图。
条形统计图的特点:能一眼看出各种数量的多少。
条形统计图一般是由标题、制作日期、单位名称、条形、横轴、纵轴等组成。


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