《义务教育数学课程标准》指出:“教学是预设与生成、封闭与开放的矛盾统一体。”不难看出课堂教学中的预设与生成是相互依存的,只有处理好预设与生成的关系,才能真正构建师生互动的课堂。下面就以“解决问题的策略”一课为例,谈谈我对预设与生成的理解。本课教学逆推策略,逆推也叫还原,就是从反面去思考,从问题的结果一步一步地反面思考。在解决某一个问题的过程中,当你从正面进行思考遇到阻碍,碰到困难的时候,可以换个思路从 “Compulsory education mathematics curriculum standards” pointed out: “Teaching is the contradiction between presupposition and generation, closure and opening.” It is easy to see that the default and generation in classroom teaching are interdependent, and only deal with the default and The relationship generated in order to truly build interactive classroom teachers and students. Here’s a “Problem Solving” lesson, for example, to talk about my understanding of presets and builds. The teaching of reverse strategy, reverse thrust is also called reduction, is to think from the opposite, from the results of the problem step by step to think negatively. In the process of solving a certain problem, you can change your mind when you face difficulties from the positive thinking and from difficulties