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计算的估计、度量的估计、数量的估计,三种不同的“估计”中,计算的估计简称为估算。估算的主要思想是把握数的大致范围。估算应根据学生已有的知识和题中的具体条件,让学生对算式的结果迅速作出大概的判断,懂得什么情况下宜于估算而不必作出精确计算,并会加之应用,从而有效地解决实际问题,快速地判断一些计算结果的合理性。因此,在小学数学教学中,必须重视和加强估算的教学。一、明确估算的作用(一)估算促进口算。很多估算是建立在口算的基础上进行
The calculated estimate, the estimated estimate, the estimated quantity, and the three different “estimates”, the calculated estimate is simply estimated. The main idea of estimation is to grasp the approximate range of numbers. Estimates should be based on the student’s existing knowledge and the specific conditions of the questions, so that students can quickly make a general estimate of the results of the equation, understand under what circumstances should be estimated without having to make accurate calculations, and will be combined with applications in order to effectively solve the problem Problem, quickly determine the reasonableness of some calculations. Therefore, in elementary mathematics teaching, we must attach importance to and strengthen the teaching of estimation. First, the role of a clear estimate (A) estimate to promote port count. Many estimates are based on the calculation of the mouth