《数学课程标准》指出:数学教学,要联系学生的生活实际,从学生的生活经验和已有知识出发,创设生动有趣的情境,引导学生开展观察、操作、猜想、推理、交流等活动,使学生通过 The standard of mathematics curriculum points out that in mathematics teaching, it is necessary to relate the students ’actual life, to create vivid and interesting situations based on the students’ life experience and existing knowledge and to guide students to carry out activities such as observation, operation, conjecture, reasoning and exchange. Students pass