认识厘米是小学阶段学习法定计量单位的开始,它的教育价值不只是让学生对概念作形式化的表达,更要让学生真正建立“1厘米”实际长度的空间观念。学生长度观念的形式不能单靠教师的讲授,而是要以学生的经验为基础,通过观察、操作、想象、交流等丰富多彩的体验活动逐步形 Understanding centimeter is the beginning of the legal unit of measure for studying in primary school. Its educational value not only allows students to formally express concepts, but also allows students to truly establish a space concept of actual length of 1 centimeter. The concept of student length can not rely solely on the teaching of teachers, but rather on the basis of the students’ experience, through the colorful experience of observation, manipulation, imagination and communication