学生的数学认知活动一般都应有着丰富的知识基础和经验铺垫,在教学实施前,我们应充分梳理学生的已有经验,为新知的探究与生成夯实基础.初中阶段,数轴是“数形结合”的起点,是学习平面直角坐标系、函数等知识的基础.对这一知识的教学,原始经验的梳理显得尤为重要.“数轴概念的教学,关键是要用好教科书中的具体实例、学生生活中的具体事例,引导学生进行观察、比较、分析和综合等思维活动”.因此,为了让学生很 Students’ mathematics cognition activities should generally have a rich knowledge base and experience. Before the implementation of teaching, we should fully review the students’ existing experience and lay a solid foundation for the exploration and generation of new knowledge. In the junior middle school stage, the number axis is a number. The starting point of form integration is the basis for learning the knowledge of the plane rectangular coordinate system, functions, etc. The teaching of this knowledge and the combing of the original experience are particularly important. “The key to the teaching of the concept of axes is to use well the textbooks. Concrete examples and concrete examples in student life guide students in thinking activities such as observation, comparison, analysis, and synthesis”. Therefore, in order to make students