《数学课程标准》提出:数学学习内容应当是现实的、有趣的、富有挑战性的,教学中应当充分重视学生亲身感受、实践操作、合作交流,给学生提供探索与交流的空间,数学学习过程真正成为在学生已有经验基础上的主动构建过程,使学生成为学习的主人。 The standard of mathematics curriculum puts forward that the content of mathematics learning should be realistic, interesting and challenging. In teaching, students should pay full attention to students’ personal experience, practical operation, cooperation and exchange, space for students to explore and exchange, mathematics learning process Truly become the active construction process based on the students’ existing experience, so that students become the masters of learning.