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【案例背景】新课程要求把课堂还给学生,数学教师课堂教学中要将过去的传授、灌输知识改变为学生的探究、对话;要将学生的被动地接受知识改变为今天的动手、动脑相结合的主动探究。笔者在进行“探索多边形的内角和”的教学时,进行了一次数学实验。探究的问题是:一个多边形剪去一个角后,它的内角和与外角和各有什么变化?结果在本节课上通过学生的动手、动脑以及相互间的合作交流,使本节课变得生动有趣,精彩纷呈。学生们思维的火花得以闪耀,他们的学习热情在玩剪纸的过程中得到了空前高涨。
Case Background The new curriculum requires returning the class to the students. In the classroom teaching of the mathematics teacher, the past teaching and instilling knowledge should be changed into the inquiry and dialogue of the students. The students’ passive acceptance of knowledge should be changed into today’s hands-on brainstorming The active exploration of combination. The author carried out a mathematical experiment while carrying out the teaching of “exploring the interior angles and polygons of polygons”. The question to be asked is: what happens to a polygon after it has been cut off from one corner, and what is the difference between the inside and outside corners of the polygon? In this lesson, the lesson becomes available through student hands, brains and mutual cooperation Vivid and interesting, brilliant. Sparks of student thinking shone, and their enthusiasm for learning got an unprecedented rise in paper cutting.