只要是教过人教版实验教材(二年级上册)“角的初步认识”这节课的老师都会有同感,就是在教学第42页第3题比较角的大小这个习题时,往往感到力不从心,难点不太好突破,那么到底如何有效地突破这个难点呢?下面两个教学案例的对比很能说明这个问题。由于这两节课在一个关键处点拨、? As long as it is to teach the PEP experimental teaching materials (grade two) “angle of the initial understanding of” teachers in this class will have the same feeling, that is, in the teaching of the third question of the size of the corner compared to the size of the problem, often feel powerless, Difficulties are not very good breakthrough, so in the end how to effectively break through this difficulty? The following two cases of teaching is very illustrative of this problem. As these two classes at a crucial point of dialing?