数学课程标准指出:“数学教学要紧密联系学生的生活环境,从学生的经验和已有知识出发,创设有利于学生自主学习、合作交流的情境”.根据课程标准的要求,在教学实践中,教师应当以学生的生活经验、已有知识为基础,根据教学内容,学生的认知特点及兴 Mathematical curriculum standards that: “mathematics teaching should be closely linked to students ’living environment, starting from the students’ experience and existing knowledge, to create a situation conducive to student self-learning, cooperation and exchange. ” According to the requirements of the curriculum standards in teaching practice , Teachers should be based on the students’ life experience, existing knowledge, based on the teaching content, the cognitive characteristics of students and Xing