在小学数学教学过程中,教师为举一反三,巩固学生对相关知识的记忆、深化理解或者提高运用能力,会经常自编一些题目加强练习。一般来说,需要自编习题的时机有两种情况:一是练习过程中需要临时增加练习的数量和强度;二是以自编习题作为练习题目。这两钟情况是有区别的。前者是在课堂练习过程中发生的。在练习课的课堂教学及讲评过程中,教师临时发现学生对某一问题存在理解或者运用能力方面有欠缺,需要进行强化,同时又有足够的时间允许教师带领学生进行练习。这时,教师就要当机立断,马上针对相 In the process of primary school mathematics teaching, teachers try their best to reinforce the students ’practice of consolidating students’ memory of relevant knowledge, deepening their understanding or improving their ability of using them. In general, the timing of self-study exercises in two situations: First, the process of practice need to temporarily increase the number and intensity of exercises; second self-made exercises as exercises. There are differences between these two clocks. The former happened during the class practice. During the practice class teaching and commenting process, the teacher temporarily finds that the students lack the ability to understand or use a certain problem, which needs to be strengthened and there is enough time for the teacher to lead the students to practice. At this time, teachers should act decisively, immediately targeted