《数学课程标准》指出:“有效的数学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习数学的重要方式。”自新课程实施以来,课堂教学发生了许多变化:教师的讲解少了,学生的活动多了;课堂气氛活跃了,学生动手 The standard of mathematics curriculum states: “Effective mathematics learning activities can not rely solely on imitation and memory, hands-on practice, independent exploration and cooperation and communication are important ways to learn mathematics.” Since the introduction of the new curriculum, many classroom teaching has taken place Change: Teachers explain less, more students activities; class atmosphere active, students hands-on