关系模型就是表示数量之间关系的模型。小学数学中常见的数量关系包括速度、时间和路程关系,单价、数量和总价关系,工作时间、工作效率和工作总量关系,正比例关系和反比例关系等。如果学生能熟练应用这些数量关系解决实际问题,他们的学习就会事半功倍。因此,教师要注重引导学生自主建构数量关系模型。江苏省优质课比赛一等奖获得者顾宪聪老师执教的“常见的数量关系”为我们做了很好的示范。他大胆放手,引导学生用数学眼光寻找数量关 Relational models are models that represent the relationship between quantities. The common quantitative relations in elementary mathematics include speed, time and distance, unit price, quantity and total price, working time, work efficiency and total amount of work, positive proportion and inverse proportion. If students can skillfully apply these quantitative relationships to solve practical problems, their learning will be more effective. Therefore, teachers should pay attention to guide students to construct quantitative relationship model. Jiangsu Province, the first prize winner in quality competitions Gu Guocong teacher coaching “common quantitative relationship ” for us to do a good demonstration. He boldly let go and guide students to look for the number of mathematics