计算教学在小学数学教学中所占比重极大,小学一年级20以内的加减法是计算的重要基础,如何让低年级的学生理解算理,掌握口算方法,科学有效地训练,从而达到准确高速的目的,是20以内加减法的主要教学目标之一。笔者从关注学生计算方法的习得和科学有效地训练学生口算等两方面进行了教学尝试,取得了较好的成效。 Computational teaching in the primary mathematics teaching a great proportion of primary school 20 within the addition and subtraction is an important basis for calculation, how to make junior students understand the arithmetic, grasp the port arithmetic, scientific and effective training to achieve accurate The purpose of high speed, is less than 20 addition and subtraction of the main teaching objectives. The author has made some teaching attempts from the following aspects: the acquisition of students ’calculation methods and the scientific and effective training of students’ calculus, and achieved good results.