“要对估算给予更大的注意”,这是1985年在澳大利亚举行的第五届国际数学教育会议专题讨论中提出的。随着计算器的逐步普及,大数目的计算势必被计算工具代替,笔算要求将适当降低,口算、估算会广泛运用。因此教会学生估算方法,从小培养学生的估算能力将越来越显得重要。景山数学实验教材的编排就十分注意这一点:估算、心算及笔算密切结合,重视估算能力培养。我在教学中抓住实验教材的这个特点,重视估算教学,注意发展学生的思维能力,提高了学生的计算能力。一、初步渗透,反复训练教学过程是一个循环渐进、不断深化的过程。当低年级学生刚开始学习加、减、乘、除时, “To pay more attention to estimates,” as proposed in the fifth International Mathematical Education Symposium held in Australia in 1985. With the gradual popularization of calculators, a large number of computations will inevitably be replaced by computational tools, pen requirements will be reduced appropriately, and port estimates will be widely used. Therefore, teaching students to estimate the method, from an early age to develop students' estimation ability will become more and more important. Jiao Mountain mathematics experimental textbook layout is very careful about this point: estimation, mental arithmetic and pen close combination, emphasis on ability to develop estimates. In my teaching, I grasp the characteristics of experimental teaching materials, attach importance to the estimation of teaching, pay attention to the development of students 'thinking skills, improve the students' computing power. First, the initial infiltration, repeated training Teaching process is a gradual, continuous deepening process. When the junior students just started to learn plus, minus, multiply and divide,