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北师大版《数学》四年级上册的“体育场”的教学内容是大数的估计,旨在让学生学会用先估部分再估整体的策略估计生活中较大的数。在估计的时候,通常用“四舍五入”的方法把数据估成整十、整百的数进行计算。与教材配套的练习《数学课堂作业本》(浙江教育出版社)第16页有这样一道题目:74千克、68千克、71千克、67千克、73千克,
Beijing Normal University version of “Mathematics” in the fourth grade on the “stadium” teaching content is the estimation of large numbers, designed to allow students to learn to assess the overall part of the first estimate of the larger part of the overall strategy. In the estimation, usually “rounding” method to estimate the data into an entire ten, the number of 100 to calculate. And teaching materials supporting the practice of “Mathematics Classroom Homework” (Zhejiang Education Press) page 16 there is such a topic: 74 kg, 68 kg, 71 kg, 67 kg, 73 kg,