最大公约数和最小公倍数,教材是先教最大公约数,再教最小公倍数。由于求最大公约数和最小公倍数的方法相似,这两个概念又很相近,学生往往只注意它们的共同点而忽视了它们之间的差别,因此很容易混淆,出现错误。针对这种情况,在教学这一内容时,我采取同时教学的方法,引导学生通过比较认识它们的异同,再通过几个层次的练 The greatest common divisor and the least common multiple, the teaching material is to teach the greatest common divisor, and then teach the least common multiple. Since the methods of finding the greatest common divisor and the least common multiple are similar, the two concepts are very similar. Students tend to focus on their common ground and neglect their differences, making it easy to confuse and make mistakes. In response to this situation, in the teaching of this content, I adopted the method of simultaneous teaching to guide students through a more understanding of their similarities and differences, and then through several levels of practice