学生计算能力差,这是一线教师比较头痛的事.怎样去改变这一状况,毫无疑问应从源头抓起,笔者结合有理数计算教学谈谈自己的一些做法,以飨读者.一、要知“法”用“法”对于有理数的运算,简单地说,就是“判别类型,运用法则”.计算法则是指计算时必须遵循的一般规则,它促使计算过程程序化、规范化,并能保证计算的正确性.所以在计算教学时,第一,要帮助学生认可法则的合理性、可行性,虽然对学生来说,最终是要记住法则,会运用法则运算,但是了解法则的合理性,对理解法则,进而在理解的基础上记忆,是非常有益的.如在有理数加法教学时,对加法法则引入,笔者结合相关资料 Students poor computing power, which is a headache teachers more headaches .How to change this situation, no doubt, should start from the source, the author combined with the teaching of rational numbers to talk about some of their practices in order to readers.First, to know “Law ” Use “Law ” For the rational number of operations, simply put, is the “type of judgment, the use of rules.” Calculation rules refers to the calculation of the general rules must be followed, it prompted the calculation process of programming, standardization , And can guarantee the correctness of calculation.Therefore, in the calculation of teaching, first, to help students recognize the rationality of law, feasibility, although for students, the ultimate is to remember the law, the operation of the law, but to understand The rationality of the rule is very beneficial to understanding the law and then to remembering on the basis of understanding.As in the teaching of rational addition, the introduction of addition law, the author combined with relevant information