新课标指出:数学活动必须建立在学生认识发展水平和已有知识经验基础之上,强调从学生已有的学习经验出发,由学生亲历实际抽象成数学理论的过程,从而学生获得对数学理解的同时,在思维能力,情感态度等方面得到进步与发展。 The new curriculum standard points out that the mathematics activities must be based on the students’ level of knowledge and the existing knowledge and experience. The emphasis is on starting from the students’ existing learning experiences and the students’ actual experiences of mathematics theory abstraction, so that students can acquire mathematical understanding At the same time, he has made progress and development in thinking ability and emotional attitude.