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1.设计理念.数学概念比较抽象,初中学生由于受年龄、生活经验和智力发展等方面的限制,要接受教材中的某些概念是不容易的.在教学过程中,一些教师不注意结合学生心理发展特点去分析事物的本质特征,只是照本宣科地提出概念的定义,缺乏生动的讲解和形象的比喻,对某些概念讲解不够透彻,使得一些学生对概念常常是一知半解,也就无法对概念正确理解、记忆和应用.在北师大版九年级(下)“车轮为什么做成圆形的”一课中学生若能理解好圆的概念,就可以比较容易理解点和圆的位置关系.这一课的教学中如何引导学生抓住“圆”的概念本质呢?笔者认为,应该引导
1. Design concept. The mathematical concept is relatively abstract. Due to the limitations of age, life experience and intellectual development, it is not easy for junior high school students to accept certain concepts in the textbook. In the teaching process, some teachers do not pay attention to the combination of students. The characteristics of psychological development to analyze the essential characteristics of things, just according to the definition of conception proposed in the field, lack of vivid explanation and image metaphor, not enough thorough explanation of some concepts, making some students often have little knowledge of the concept, it can not be correct about the concept Understanding, remembering and applying. In the Beijing Normal University’s edition of the ninth grade (below)“what makes wheels round?”, if students can understand the concept of a circle, it is easier to understand the relationship between the point and the circle. How to guide students to grasp the concept of “circle” in the teaching of this class? The author thinks that should guide