一、化归思想概述。化归思想就是人们根据已有的知识经验,通过观察、比较、推理等途径,将某些已知条件或数量关系转化为另一种形式,从而使问题易于解决的思想。化归思想在小学数学教学中,虽然没有明确提出,但在具体的教学内容中均有所渗透。例如,将相同加数的求和转化为用乘法计算;求不规则图形的面积,将其化归为已学过的规则图形来考察;解复合应用题时,将其化归为简单应用题来求解等等。二、化归思想在教学中的作用。1.有利于知识的形成。化归思想是建立在新旧知识联系的基础上展开的,因此对于概念、法则、公式、性质的教学,运用化归思想进行,有利于知识的 First, an overview of the thought of return. The idea of ​​returning to the people is based on the existing knowledge and experience, through observation, comparison, reasoning and other means, some known conditions or quantitative relationship into another form, so that the problem easy to solve the idea. The thought of returning to normalization in primary school mathematics teaching, although not explicitly put forward, but in the specific teaching content are infiltrated. For example, the summation of the same addends is converted into multiplication; the area of ​​an irregular graph is calculated, and its normalization is classified as the learned regular graph. When solving a composite application problem, it is classified as a simple application problem To solve and so on. Second, the role of the return of thought in teaching. 1 is conducive to the formation of knowledge. The idea of ​​returning to the nature is based on the connection between the old and the new knowledge. Therefore, the teaching of concepts, laws, formulas and properties should be carried out using the principle of returning to the past and be conducive to knowledge