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正方形和长方形周长的教学(人教版九年制小学数学义务教材第五册)包含着周长概念的建立和正方形、长方形周长的计算方法两方面的内容。周长的意义、图形的特征是学生理解周长算法算理的基础。一、引导操作抽象概念操作能使学生得到直接的感知,形成鲜明的表象,所以例题的教学要注意指导学生操作。先指导学生照样子在钉子板上用橡皮筋围成三角形、正方形、长方形、平行四边形;再指导学生用尺
The teaching of square and rectangular perimeter (PEP-5 elementary school mathematics compulsory textbook fifth) contains the concept of perimeter and square, rectangular perimeter calculation method of two aspects. Perimeter significance, the characteristics of graphics is the basis for students to understand the algorithm of perimeter algorithm. First, the guide operation Abstract concept operation can make students get direct perception, the formation of a clear appearance, so the teaching of examples should pay attention to guide students to operate. First guide students as usual in the nail board with a rubber band surrounded by triangles, squares, rectangles, parallelograms; then guide students to use ruler