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数学第七册安排了用七巧板拼图的练习,这个练习可以起三个作用。第一、引起学生的学习兴趣;第二、帮助学生掌握图形的一些性质;第三、通过练习,为用割补法计算组合图形的面积打下基础。为了充分发挥这一练习的作用,我是这样做的: 1、通过实际操作,巩固概念。我事先叫学生准备一张硬纸板和一把剪刀,课堂上指导学生在硬纸板上剪下一个每边长10厘米的正方形,利用画垂线、平行线的知识把这个正方形分成7块,再把它剪下来,然后引导学生得出这七个图形中有5个等腰直角三角形、一个正方形和一个平行四边形,最后指
The seventh book of mathematics arranges the practice of jigsaw puzzles, which can play three roles. The first is to arouse students' interest in learning. The second is to help students master some of the properties of graphics. The third is to lay the groundwork for calculating the area of the combined graphics by using the method of slimming. In order to give full play to the role of this exercise, I did so: 1, through the actual operation, to consolidate the concept. In advance, I asked the students to prepare a piece of cardboard and a pair of scissors. In class, the students were instructed to cut a 10 cm square on each side of the cardboard. Divide the square into seven squares by drawing vertical and horizontal lines. Cut it out, and then guide the students to draw the five isosceles right triangles, a square and a parallelogram of the seven graphics, and finally the