三年级数学上册第9单元《数学广角集合》教学设计新人教版.doc

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1、1数学广角集合【教学目标】1.理解集合圈里各部分的意义。2.会读集合圈中的信息,会按条件填写集合圈。3.使学生会借助直观图,利用集合的思想方法解决简单的实际问题。【教学重难点】1.会读集合圈中的信息,会按条件填写集合圈。2.使学生会借助直观图,利用集合的思想方法解决简单的实际问题。【教具准备】PPT 课件【教学过程】1、“脑筋急转弯”游戏引入问题1、两个爸爸带着两个儿子去博物馆参观,他们只买了三张票就进去了,为什么?(强调爸爸身份的双重性身份“重复”了)2、从前数,我排第三,从后数,我排第四,请问共有多少人排队?(我“重复”了,画图更直观的示意出来)2、新授例题:下表是三(1)班参加跳绳、踢毽

2、比赛的学生名单跳绳 杨明 陈东 刘红 李芳 王爱华 马超 丁旭 赵军 徐强踢毽 刘红 于丽 周晓 杨明 朱小东 李芳 陶伟 卢强参加这两项比赛的共有多少人?引导学生观察名单,发现“重复”人名,再提出集合图表表示法。跳绳组 踢毽组跳绳组 踢毽组两项都参加的引导两种列算式求总数的方法:法一: 6 + 3 + 5 14(人)法二: 8 + 9 3 14(人)三、做一做 1、教材 P105 12、统计人数:(模仿例题进行统计并回答问题)(1)喜欢足班和篮球的分别有多少人?(2)统计表中一共有多少人?3、思考题(难度提升题,此题根据时间可选讲或留课后作业)三年级(1)班的部分同学参加“运动会”,其中参加跳绳比赛的有 22 人,参加跑步比赛的有 28 人,两项都参加的有 10 人,共有多少人参加比赛?2

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