《义务教育数学课程标准》(2011年版)提出:通过数学学习,学生能够获得适应社会生活和进一步发展所必需的数学基础知识、基本技能、基本思想、基本活动经验。对于活动经验的获得,需要学生在数学活动中体验,通过教师创设的教学情境、学生的自主探究与合作交流来实现由直观到抽象、由感性到理性的飞跃,从而在体验中形成经验,在思考中生成智慧。1学习起点是活动体验的基础学生的学习起点指的是学生的认知发展水平和已有经验的起点,其中认知发展水平起点是指学生已 The Compulsory Education Mathematics Curriculum Standard (2011 Edition) put forward that through mathematics learning, students can acquire the basic knowledge of mathematics, basic skills, basic ideas and basic activities necessary to adapt to social life and further development. For the acquisition of activity experience, students need to experience in mathematics activities, through the teaching context created by teachers, students' independent exploration and cooperation and exchange to realize the leap from intuitive to abstract and from sensibility to rational, so as to form experience in experience Generate wisdom in thinking. A learning starting point is the basis for activity experience Students' learning starting point refers to the level of cognitive development of students and the starting point of existing experience, where the level of cognitive development refers to the students have