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[回顾]“比一比”是北师大版数学三年上册第六单元第一节课,主要内容是认识平均数和求平均数。2005年,吴正宪老师来大庆讲学时上过这节课。为了引出“平均数”的概念,吴老师首先设计了“拍球”的情境:“将学生分成人数相等的两队,通过和学生自由谈话引出:‘老师想了解一下咱们班这两队同学的拍球水平,你们说该怎么办?’……在学生谈出自己的不同想法以后,教师结合生活实际肯定了‘每队选几个代表拍球’的做法,并在教室
[Recall] ”Than a ratio“ is the first division of the sixth unit of Beijing Normal University Edition three years of mathematics, the main content is to understand the average and average. In 2005, Wu Zhengxian had come to Daqing to lecture this class. In order to derive the concept of ”average“, Wu first designed the scenario of ”ball-shooting“: ”Divide the students into two teams of equal numbers and lead them out through conversation freely with the students:“ The teacher would like to know about our class After the students talked about their different ideas, the teachers combined with their actual affirmation of the practice of ”shooting a ball by selecting a few delegates for each team", and in the classroom