课前游戏:生猜老师的年龄——怎样知道老师到底多大了?(出示身份证验证)——得出结论。【评析】这是一个较精彩的引入。一方面,游戏的设计拉近了学生与老师的距离,为顺利进行本节课教学奠定了基础,游戏的设计也符合小学生好奇的年龄特征,有较强的吸引力,能使学生兴趣盎然地参与到学习活动中。同时,游戏的设计与本节课所渗透的建模方法“猜测—验证—修 Pre-class game: students guess the age of the teacher - how to know the teacher how old? (Produce ID verification) - to conclude. 【Comment】 This is a more wonderful introduction. On the one hand, the design of the game narrows the distance between the students and the teachers, and lays the foundation for the smooth teaching of this lesson. The design of the game is also in line with the curious age characteristics of the pupils. It has a strong appeal and enables the students to have fun Participate in learning activities. At the same time, the game design and modeling methods infiltrated in this lesson ”guess - verify - repair