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我们听了吴菊良老师执教的“三角形内角和是180°”后,久久不能忘怀,觉得优点很多.但在众多的优点中,我们认为最突出的一点是充分让学生动手操作,发挥操作在几何教学中的作用.下面就这方面谈点观感.一、动手操作有利于概念的建立和形成“三角形内角和是180°”这个抽象的概念,对于小学生来说,如果没有足够的表象支持,是难以建立的.吴老师为了把特定的概念“外化”为动手操作程序,采用了以下四种方式:一是度量,要求学生量出三个三角形每个内角的度数,并算出各个三角形的
After we listened to what Professor Wu Ju-liang coached, “the angle of the triangle is 180 °”, we can not forget a long time and think that there are many merits, but among the many advantages, we think that the most prominent point is that students should be able to fully operate and operate Geometry teaching in the role of the following on the point of view in this regard. First, the hands-on operation is conducive to the establishment and formation of the concept of “triangle angle and is 180 °” the abstract concept for primary school students, if there is not enough representation Support, it is difficult to establish.Wu teacher in order to specific concepts “externalization ” for the hands-on procedures, the use of the following four ways: First, the measure requires students to measure the degree of each of the three triangles, and Calculate each triangle