在进行有理数运算的教学时,学生经常出现运算错误,出错率较高便是运算符号的问题,经过认真的观察和思考,发现主要有两个方面的问题.一、思想意识方面的问题首先,有些教师对计算教学明显存在轻视心理,认为计算题比较简单,不需要过多地讲解,没有从算理上下过多功夫,认为多练几遍就会做了,练习题的安排常常是机械重复的偏多,甚至有些教师认为学习数学的过程就是熟能生巧的过程,其实不然.学生明白 During the teaching of rational number arithmetic, the students often have the operation error, and the error rate is the symbol of the operation symbol. After careful observation and reflection, it is found that there are mainly two aspects. First, the problem of ideology First, Some teachers apparently ignored the teaching of teaching, that calculation is relatively simple, do not need to explain too much, did not work too much effort from the arithmetic, that practice will be done more than a few times, exercises are often arranged mechanical repetition , And even some teachers think that the process of learning mathematics is a process that happens to be perfect, but it is not. Students understand