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最近听了一节数学课(五年级上册),其中一个教学片断引发了我的思考。教学片断如下:题目袁老师带120元钱去买文具盒,每个文具盒25元,最多可以买几个文具盒?学生列竖式解答:120÷25=4.8(个)学生说想法。生:可以买4个文具盒。买4个后剩下的钱不够再买1个,应用去尾法。谁知生A不服气:我认为可以买5个文具盒。教师停顿了片刻,对生A说,说说你的理由。生A:可以让售货员便宜一些卖。我已经买了那么多的文具盒,再买一个只差5元钱。如果这个店不肯卖,可以到别的商店去买。
Recently heard a math class (grade five), one of the teaching piece triggered my thinking. Teaching pieces are as follows: Title Yuan teacher with 120 yuan to buy stationery, 25 yuan per stationery, up to buy a few stationery? Students column vertical solution: 120 ÷ 25 = 4.8 (a) students say the idea. Students: You can buy 4 stationery boxes. After buying four remaining money is not enough to buy one, the application to the tail method. Who knows students A not convinced: I think you can buy five stationery boxes. The teacher paused for a moment and said to the student A, explaining your reason. Health A: can make the salesclerk cheaper to sell. I have bought so many stationery boxes, and then buy a difference of only 5 dollars. If the store refused to sell, you can go to other stores to buy.