To be fast and accurate, we must be strict with ourselves, even harsh. Don't allow yourself to make mistakes, take them seriously, persevere, and slap yourself if you are wrong. When calculating on draft paper, the steps must be clear and orderly, not from east to west, but from top to bottom or from left to right. As for the improvement of computing ability, there are three methods, one is mental arithmetic, the other is memory, and the third is simple operation. Many topics can be completed directly by mental arithmetic without using draft paper at all. Get into this habit, and when the time comes to calculate, you won't use so much draft paper. Some annoying calculations, written on paper will consume a lot of pen and ink. If you can do mental arithmetic, you will save pen and ink and time. The second is to memorize some commonly used operation results and some specific formula simplification skills, such as: 13× 13= 169. Third, simple operations, generally in junior high school, are all about merging similar items and decomposing factors. Simple operations in senior high school are based on the structure of formulas, and so is physics. Of course, the most important thing is to train yourself more, practice more and do more math problems with a large amount of calculation according to these methods and problems that need attention.