“数学教学应该从学生生活经验和已有知识背景出发,向学生提供充分从事数学活动和交流的机会。有效的学习活动不能单纯地依赖模仿与记忆,动手实践、自主探索与合作交流是学生学习数学的重要方式”。这是《数学课程标准》所倡导的基本 “Mathematical teaching should start from the student life experience and existing knowledge background, to provide students full opportunity to engage in mathematical activities and exchanges.Effective learning activities can not simply rely on imitation and memory, hands-on practice, independent exploration and cooperation and exchange students An important way to learn math ”. This is the “Math curriculum standards” advocated by the basic