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小学数学教学的一项重要任务是培养计算能力。关于计算能力,大纲提出了“算得正确、迅速,同时还应注意计算方法合理、灵活”的要求。为达到这一要求,小学数学教材中编排了一些简便运算的教学内容和练习题,归纳起来,常用的简便算法有下面三种。一、应用运算定律、性质来改变运算顺序,以达到运算简便的目的。1.应用交换律和结合律使运算简便。
An important task in elementary mathematics teaching is to develop computational skills. With regard to computing power, the outline proposed the “correct and rapid calculation, while paying attention to the reasonable and flexible calculation method”. In order to meet this requirement, primary school mathematics textbooks are arranged with some simple teaching contents and exercises. In summary, commonly used simple algorithms have the following three kinds. First, the application of laws of operation, the nature of the order to change the operation in order to achieve the purpose of computing convenience. 1. Apply the commutative law and the law of combination to make the calculation easy.