计算教学是小学数学的重要组成部分。新课程标准明确的指出:计算应是学生经历从现实生活中抽象出数和简单的数量关系,在具体的情境中理解,并应用所学的知识解决问题的过程,应避免繁杂的运算,避免将运算和应用割裂开来。实际上,新教材追求在计算教学的过程中结合学生的生活实际,使学生掌握合理、灵活的计算方法,提高估算能 Calculation teaching is an important part of elementary mathematics. The new curriculum standard clearly points out that the calculation should be a process in which students experience abstraction of numbers and simple quantitative relations in real life, understand in specific contexts and apply the learned knowledge to solve the problems, and should avoid complicated operations and avoid The operation and application of separated. In fact, the new textbook pursuit of teaching in the calculation process combined with the actual life of students, so that students master the reasonable and flexible calculation methods to improve the estimation of energy