《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。动手操作对激发学生学习数学的兴趣,扫除学生思维的障碍等方面具有十分重要的作用。因此,在数学教学中,教师必须创设实践活动的情境,让学生亲身参与实践操作。 Mathematical Curriculum Standards states that 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. Hands-on operation is very important for stimulating students ’interest in learning mathematics and for removing the obstacles of students’ thinking. Therefore, in mathematics teaching, teachers must create the context of practical activities, so that students can personally participate in practical operation.