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[教学内容]北师大版小学数学教材三年级下册69-72页。[教材分析]“比一比”是北师大版数学三年级下册第六单元“统计与可能性”第一课时教学内容,本节课是在学生了解平均分与认识条形统计图的基础上,结合对统计数据的分析来理解平均数的意义。教材中提供了两队投篮比赛的问题情境,遇到判断比赛双方的人数不相等时谁胜谁负的问题,引出评判胜负的方法需要借助平均数,突出平均数的实际意义与存在价值。
[Teaching content] Beijing Normal University version of primary school mathematics textbook third grade 69-72 pages. [Textbook analysis] “than a ratio ” is the sixth unit of the third grade under the third grade of Beijing Normal University Edition “Statistics and Possibilities ” the first class teaching content, this class is the students understand the average points and cognitive On the basis of the shape chart, combined with the statistical analysis to understand the significance of the average. The teaching materials provided the situations of two team shooting competitions, encountered the question of who wins and won when judging the number of both sides of the competition, and the method of deriving the outcome of the judgments needs the aid of the average number to highlight the practical significance and the existent value of the average.