《小学数学课程标准》指出:数学教学活动必须激发学生兴趣,调动学生积极性,引发学生思考;要注重培养学生良好的学习习惯、掌握有效的学习方法。学生学习应当是一个生动活泼的、主动的和富有个性的过程,除接受学习外,动手实践、自主探索与合作交流也是数学学习的重要方 “Primary Mathematics Curriculum Standard” points out: Mathematics teaching activities must stimulate students ’interest, arouse students’ enthusiasm and trigger students ’thinking; pay attention to cultivating good students’ study habits and master effective learning methods. Student learning should be a lively, active and personalized process, in addition to acceptance of learning, hands-on practice, independent exploration and cooperation and exchange is also an important part of mathematics learning