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小学数学教学大纲指出:“教学时,要遵循学生的认知规律,要重视学生获取知识的思维过程。”教师根据有关知识的内容,编成一定的程序,既能充分展示思维过程,使学生按序思考,有路可循,又能使学生在获取知识的同时发展智能。现列举数例进行分析说明。例(一) 用四舍五入法求近似数程序:一分、二标、三看、四写。如,把下面各数万后面的尾数省略,求出它们的近似数。 (1)93470 (2)436920 一分:用“|”分出尾数。9 | 3470 43 | 6920
Primary mathematics syllabus pointed out: “teaching, we must follow the students' cognitive rules, we should attach importance to students thinking process of acquiring knowledge. ” Teachers according to the content of knowledge, compiled into a certain procedure, both to fully demonstrate the thinking process, So that students think in order, follow the road, but also enable students to acquire knowledge while developing intelligence. Now cite a few examples for analysis. Example (a) Use the rounding method to find the approximate number of procedures: a minute, two, three, four write. For example, omit the mantissa of the following tens of thousands and find their approximate number. (1) 93470 (2) 436,920 One point: The mantissa is separated by “| ”. 9 | 3470 43 | 6920