数学就是计算,离开了计算的数学学习就成了“无源之水,无本之木”。可见计算能力对于学习数学的重要性。但从平时练习,考查来看,目前初中学生的运算能力薄弱,速度慢,走弯路,常出差错,应证了数学计算中“符号害死人”那句话。因此,在教学中必须加强指导和训练,逐步提高学生的运算能力。学生计算中容易出错的原因主要是基础不牢、计算马虎、缺乏技巧。针对这些原因,培养学生的计算能力应注意以下几个方面。一、培养学生良好的计算习惯是提 Mathematics is the calculation, leaving the calculation of mathematical learning has become “passive water, without the wood ”. Visible computing power for learning mathematics. However, from the usual practice and examination, the present junior high school students are weak in computing power, slow in speed, detours, and often make mistakes. They should prove that the mathematical symbols “kill the dead”. Therefore, we must strengthen the guidance and training in teaching, and gradually improve the computing power of students. The main reason why students make mistakes in calculation is that the foundation is not strong, calculating sloppy, and lack of skills. For these reasons, the training of students should pay attention to the following aspects. First, to develop good habits of students is to mention