3. Students personally experience the quantitative order of things in life and experience the fun of learning mathematics. In deepening the understanding of "which number", teachers can organize related activities to enrich students' perceptual knowledge of "which number" and "which number" and make students feel that mathematics is around, visible, tangible and useful. The realization of life-oriented mathematics teaching not only enables students to understand and apply what they have learned in pleasant activities, but also cultivates students' sense of cooperation and service.