【案例背景】计算教学是要让学生结合具体情境,体会四则运算的意义,能结合具体情境进行估算,并解释估算的过程,经历与他人交流各自算法的过程,能灵活运用不同的方法解决生活中的简单问题,并能对结果的合理性进行判断。由于低年级学生的思维特点是具体形象思维占优势,因此,应该从儿童的年龄特征和思维特点出发,教学时,不仅要运用实物、模型、挂图等进行直观演示,还要让学生亲自参与探究知识形成的过程,通过动手操作学具,来 【Case Background】 Computational teaching is to enable students to combine the specific context, understand the meaning of the four operations, can be combined with the specific situation to estimate, and explain the estimation process, experiencing the process of communicating with each other their own algorithms, flexible use of different methods to solve life In the simple question, and can judge the reasonableness of the result. Because the thinking characteristic of the lower grades is that the specific thinking of the image is predominant, we should start from the children’s age characteristics and thinking characteristics. When teaching, we should not only use the real objects, models, flipcharts and other visual demonstration, but also let the students personally participate in the inquiry The process of knowledge formation, through the operation of learning tools