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笔者认为对数量关系的有效教学首先应立足“关键”——速度意义的理解,让学生对速度的理解经历由生活化经验到数学化认知的学习过程。其次引导学生在对关键概念理解的基础上运用已有认知经验自主构建数量关系。最后鼓励学生运用策略方法解决相关的实际问题,进一步完善思考模式等三个层次来推进学生对数量关系的学习过程。现结合“路程、时间和速度”教学实践谈谈在课堂中如何把握数量关系的教学。一、借助生活经验,实现关键概念的数学化认知
The author believes that the effective teaching of quantitative relationship should first be based on “key ” - understanding of the speed of meaning, allowing students to understand the speed of experience from the experience of life to the mathematical process of cognitive learning. Second, to guide students in the understanding of the key concepts based on the use of existing cognitive experience to build the number of relationships. Finally, encourage students to use strategies to solve practical problems, and further improve the thinking mode to promote students’ learning process of quantity relationship. Is a combination of “distance, time and speed ” teaching practice to talk about how to grasp the amount of teaching in the classroom. First, with the help of life experience, realize the mathematical understanding of key concepts