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在《认识负数》一课里,A教师通过指导学生认识温度计及温度计测得的气温信息,告诉学生用零上4℃和零下4℃记录气温信息太麻烦,所以我们常记作+4℃和-4℃。B教师在指导学生认识温度计的基础上,出示了零上4℃和零下4℃的气温信息,要求学生在温度计简易图上同时标一标这样的零上4℃和零下4℃,学生通过画图深刻体会到0℃在表示零上4℃和零下4℃过程中的重要意义。对比两老师的做法,A教师是让学生通过“听”来“知道”正负数的不同表
In the lesson of “Knowing the Neglect”, Teacher A told students to know the temperature information of the thermometer and the thermometer by telling them that it is too troublesome to record the temperature information between 4 ℃ and 4 ℃. Therefore, -4 ° C. B teachers in guiding students to know the thermometer, based on the show 4 ℃ and 0 ℃ minus 4 ℃ temperature information, requiring students to simultaneously marked on the thermometer simple standard such a standard 4 ℃ and 0 ℃ minus 4 ℃, the students draw Deeply aware of 0 ℃ in the representation of zero on the 4 ℃ and minus 4 ℃ in the process of significance. Compare the two teachers practice, A teacher is to let students through “listen ” to “know ” positive and negative different table