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小学数学教学大纲要求学生算得正确、迅速,同时还应注意计算方法的合理、灵活。由此可知,简便计算是小学数学教学中的一项重要内容。下面就简便计算谈三点体会。一、简算的实质是变形、凑整。小学数学中的简算,主要是应用五大定律(加法交换律、加法结合律、乘法交换律、乘法结合律、乘法分配律)和数的运算
Primary mathematics syllabus requires students to be correct, rapid, but also should pay attention to the calculation method is reasonable and flexible. It can be seen that simple calculation is an important part of primary school mathematics teaching. The following simple calculation to talk about three experiences. First, the essence of simple calculation is deformation, rounding. Primary mathematics in the simple calculation, the main application of the five laws (addition exchange law, combination law, multiplicative exchange law, multiplication law, multiplication law) and the number of operations