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课程改革以来,“估算”成为小学数学课程内容并逐渐被重视和落实,但教师们教学这部分内容时也产生了很多疑难问题。在福州市开展的“小学数学教学疑难问题调研”活动中,就收集到了教师们反映的大量有关估算教学的疑难和困惑。我们将这些问题进行归类整理,选取其中几种主要的情况进行了研究探讨,现将研讨成果整理如下。一、估算方法采用要注重“灵活性”【疑难呈现】估算时一定用四舍五入法吗?具体问题:估算631-409,把409看成
Since the curriculum reform, “estimate ” has become the primary mathematics curriculum content and gradually be valued and implemented, but teachers also have a lot of difficult problems in teaching this part. In Fuzhou City to carry out “” primary mathematics teaching difficult problems “activities, collected a lot of teachers reflect the difficulties and confusion about the estimation of teaching. We will classify these problems, select several of the major situations for research and discussion, the research is summarized as follows. First, the estimation method used to pay attention to ”Flexibility " [Difficult to show] Estimate must use rounding method? Specific issues: Estimate 631-409, 409 as