一、谈话导入师:知道我姓什么吗?生:姓谢。师:对,我姓谢,感谢的谢,谢谢大家陪我来上课。师:我儿子也上五年级,前段时间他跟我说了一件事,我没想到,我觉得很有道理。他说学到现在,五年级的数学课跟一个字关系非常密切,而且他跟我说,这个字是“分”(师板书)。【评析:因为借用校长所教的班的学生上课,校长已经对执教教师做了 First, talk to import division: know what my last name? Health: surnamed Xie. Teacher: Yes, my name is Xie, thank you, thank you for coming to class with me. Teacher: My son also on the fifth grade, some time ago he told me one thing, I did not think, I think it makes sense. He said that now that the fifth grade math class has a very close relationship with a word, and he told me that the word is “sub” (teacher’s book). 【Comment: Because borrowing the class taught by the principal class, the principal has done coaching teachers