“平均数”(人教版课程标准实验教科书数学三年级下册第三单元第42页例1)是在学生已具有一定的收集和整理数据能力的基础上进行教学的。本节课的教学重点是通过创设具体的问题情境,充分调动学生的积极性,让学生在学习活动中自主探究和体验平均数的意义和算法,感受平均数是从实际生活中产生的。 “Average” (Example 1) is based on the students have some ability to collect and organize data on the basis of teaching. This lesson focuses on teaching through the creation of specific problem situations, fully mobilize the enthusiasm of students, allowing students to independently explore and experience the meaning of learning in the learning activities and algorithms, the average number is felt from the real life.