有理数的加法法则是学生从小学升入初中的首个也是最重要的法则。参照不同版本的课改实验书的教法,我发现学生理解的情况与掌握的效果不尽相同。下面,我就从我使用过的三种版本谈一谈:首先,从“苏科版”教材来看,它出现了两种引例。其一:通过足球比赛进球与失球的个数(注:这里进球与失球的个数不全都是 The law of addition of rational numbers is the first and foremost law for students to move from elementary school to junior high school. With reference to the teaching of different versions of the experimental curriculum, I found that students understand the situation and master the effect is different. Below, I will talk about three versions I have used: First of all, from the “Suke version” textbook, it appeared two examples. First: the number of goals scored and goals conceded by the football match (Note: the number of goals and goals conceded here are not all