教师要善于引导学生对一些相关的概念进行分类,以便掌握概念的联系和形成系统,使学生形成知识网络。但有的教师在分类时,概念不清,违反分类规则,导致对概念认识上产生错误,必然影响到概念的运用。笔者在一堂公开课上就发现了这样的问题。一、引述错误分类公开课《丰富的图形世界》,选用教材:苏教版,设计题目:认一认下面几何体并把它们分类。(写出分类的依据) Teachers should be good at guiding students to classify some related concepts in order to grasp the connection of concepts and form a system so that students form a knowledge network. However, some teachers in the classification, the concept of unclear, in violation of classification rules, resulting in conceptual mistakes, will inevitably affect the use of concepts. The author found such a problem in an open class. First, quoted the wrong class Open class “rich graphics world”, the selection of textbooks: Sujiao version, design topics: identify the following geometry and classify them. (Write the basis for classification)