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在一次作业中,有一道习题全班66名学生居然有40名学生做错。这道题是:有一个整数,把它精确到万位后是1万,那么这个数最大是()。学生的主要错误是:最大是9999。既然有这么多的学生出错,这道题自然成为评讲时的重点,我要让学生不仅知道错了,而且知道为什么错了。怎样才能真正掌握,举一反三呢?带着这样的想法我开始了与学生的课堂对话。师:这道题有三个答案:9999 14999 19999(板书)
In an operation, there is an exercise in the class 66 students actually have 40 students doing wrong. This question is: there is an integer, it is accurate to the Wan million is 10,000, then the maximum number is (). The main mistake students have is: The maximum is 9999. Since there are so many students who make mistakes, this question naturally becomes the focus of the commentary. I want students not only to know what is wrong, but also to know why they are wrong. With such an idea, I started to talk to the students in class. Teacher: This question has three answers: 9999 14999 19999 (blackboard)