化归思想是小学数学基本的思想方法之一,化归方法是小学数学解决问题的一般方法。化归思想的核心就是把待解决或未解决的问题,通过某种转化过程归结到一类已经能解决或比较容易解决的问题中去,最终求得问题解决的数学思想方法。这种“迂回战术”的常见形式有:化未知为已知,化繁为简,化难为易,化抽象为具体,化非常规为常规等。下面,就结合个人教学实践,谈谈化归思想在小学数学练习活动中的运用。一、用化归思想进行变式练习,从坡度上发展 Returning to thought is one of the basic ways of thinking in elementary mathematics, and returning to normal is a general method of solving problems in elementary mathematics. At the core of the thought of return is to solve the problem to be solved or not, through a conversion process to a class of already solved or relatively easy to solve the problem, and ultimately find a mathematical solution to the problem. The common form of this “circuitous tactics ” is: the unknown is known, the complexity is simplified, the difficulty is easy, the abstract is the concrete, the unconventional is the routine and so on. Next, on the basis of personal teaching practice, talk about the thought of returning to normal practice in primary school mathematics activities. First, to change the practice of using thought to practice, from the sloping development