《数学课程标准》指出:“数学教学是数学活动的教学。教师要紧密联系学生的生活环境,从学生的经验和已有的知识出发,创设生动的数学情境……”同时还指出:“要重视从学生的生活实践经验和已有的知识中学习数学和理解 ”Mathematical Curriculum Standard“ states: ”Mathematics teaching is the teaching of mathematics activities. Teachers must closely contact students ’living environment and create vivid mathematical situations based on the students’ experiences and existing knowledge.“ At the same time, ”Emphasis should be placed on learning math and understanding from students’ practical experience and existing knowledge