《数学课程标准》指出:有效的数学学习过程不能单纯的依靠模仿与记忆,动手实践、自主探索与合作交流是学生学习的重要学习方式。教师应向学生提供充分的从事数学活动和交流的机会 The standard of mathematics curriculum points out that the effective mathematics learning process can not simply rely on imitation and memory, hands-on practice, independent exploration and cooperation and exchange are important learning ways for students to learn. Teachers should provide adequate opportunities for students to engage in math activities and exchanges