How to improve students' computing ability should start from the lower grades. I think the key is to improve students' computing ability from the following four aspects. First, a good "verbal calculation" is the prerequisite for the success of "calculation". "Compulsory Education Mathematics Curriculum Standard" points out: "To cultivate students' computing ability, we should pay attention to basic oral arithmetic training. Oral calculation is not only the basis of written calculation, estimation and simple operation, but also an important part of calculation ability. "In the teaching of oral calculation formula in Senior Two, I pay special attention to the teaching of oral calculation and adopt flexible teaching methods to let students master the formula. After that, the formula test book is established. First of all, every student must be able to recite the multiplication formula from 2 to 9 fluently and refine every formula from 5 to 2. Then the teacher personally checks the formula recitation of each sentence. For the students who passed, the teacher added extra points to the formula test book, which not only achieved the knowledge goal, but also improved the students' interest and inspired them. Secondly, let the students who can recite backwards the multiplication formula from 2 to 9. In this way, after two months of hard work, I use all available time every day to listen to students recite formulas thousands of times. Finally, I succeeded. Students with learning difficulties in the class are as excellent as top students, and the correct rate is 100%. In grade three, double digits are multiplied by double digits.