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一、建模点分析1.整体与部分的模型这个模型的建立要让学生认识到整体(单位“1”)与部分之间的关系,体会到整体(单位“1”)和部分是相对的。整体与部分的概念搞清楚了,学生就会更好地理解分数所表示的就是整体中的一部分。这里的整体(单位“1”)有两种情况:一是单个物体表示的整体,(即1个物体、1个计量单位或1个图形等)二是多个物体表示的一个整体,(即一堆橘子、全班同学等)。前者整体与部分的关系学生很容易理解,它的整体就是一个物体;而后者学生理解起来就比较困难,它这里的整体是由一定的数量组成的,部分是其中的1个或是几个,因此这部分内容放在了五年级下册。
First, the modeling point analysis 1. Overall and part of the model The establishment of this model to enable students to recognize the overall (unit “1 ”) and the relationship between the part of the experience of the whole (unit “1 ”) and Part is relative. The whole and part of the concept is clear, students will understand better that the score is represented as part of the whole. There are two cases of the whole (unit “1 ”) here: one is the whole representation of a single object (that is, one object, one unit of measurement, or one graph) (That is, a bunch of oranges, classmates, etc.). The former overall and part of the relationship between students is easy to understand, its overall is an object; the latter students to understand more difficult, where the overall is a certain number of the composition, which is part of one or several, Therefore, this part of the content on the fifth grade.