小学数学教材中,很注重简便运算,从三年级起、几乎每册都有。我想,道理很简单:加强和培养孩子们的运算技巧,为中学阶段更好地掌握因式分解打下良好基础。小学阶段的简便运算,主要是加法交换律、结合律;乘法交换律、结合律和分配律,其中以乘法分配律最难掌握。我在讲解简便运算式题过程中,体会到讲清三个定律的概念固然很重要,但是要加深孩子们对定律的理解,熟练地运用定律进行计算,还有靠于老师用浅显的比方、生动有趣的讲述来进行教学。运算能否简便,先要看老师教法是否易 Primary mathematics textbooks, pay great attention to easy operation, from the third grade, almost every book has. I think the reason is simple: to strengthen and develop children's computing skills and lay a good foundation for better master factorization in secondary school. The simple operation in primary school is mainly the law of addition and exchange, the law of combination; the law of multiplication and exchange, the law of combination and the law of distribution, of which the law of multiplication is the most difficult to grasp. While explaining the simple formula, I realized that it is important to clarify the concepts of the three laws, but to deepen the children's understanding of the law and skillfully use the law to calculate, as well as rely on the teacher with a simple analogy, Vivid and interesting to teach. Whether the operation is easy, first look at the teacher is easy to teach