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“数与运算”是小学数学教学的重要内容之一,一方面它是学习后继数学所必需的,另一方面它在人们日常生活与工作等方面有着广泛的应用。简便运算是灵活、正确、合理地运用各种定义、定理、定律、性质、法则等等,改变原有的运算顺序进行的一种计算,通过简便运算可大幅度提高计算速度及正确率,使复杂的计算变得简单。简便计算不仅仅是作为一种技能、一种运算定律或
“Number and operation” is one of the important contents of mathematics teaching in primary school. On the one hand, it is necessary to study the following mathematics, on the other hand, it has a wide range of applications in people’s daily life and work. Simple calculation is flexible, correct, and reasonable use of a variety of definitions, theorems, laws, nature, laws and so on, to change the original calculation sequence of a calculation, by simple calculation can greatly improve the speed and accuracy of the calculation, so that Complicated calculations become easy. Simple calculation is more than just a skill, an arithmetic law or