数与代数是小学阶段内容最多的一个领域。长久以来由于历史的原因,广大小学数学教师对于算术的认识比较熟悉,积累了很好的教学经验。但对于代数思维来说相对比较陌生,更多的局限于方程和正反比例这些比较明显的教学内容。另外从教材编写的角度,这些知识都集中在高年级,因此在长时间算术思维的浸润下学生的思维方式始终在算术思维的框 Number and algebra are the most elementary areas of an elementary school. For a long time due to historical reasons, the majority of primary school mathematics teachers are more familiar with arithmetic, and have accumulated good teaching experience. But for algebraic thinking is relatively unfamiliar, more limited to the equation and the positive and negative proportion of these more obvious teaching content. In addition, from the perspective of the compilation of teaching materials, these knowledge are concentrated in the upper grades, so under the infiltration of the arithmetical thinking of students for a long time the way of thinking of students always in the box of mathematical thinking