The second volume. Oral arithmetic is an important part of mathematics. To cultivate junior students' oral arithmetic ability, we should not only strengthen the training of students' basic skills, but also pay attention to the targeted training of students. As a basic mathematical skill of primary school students, oral arithmetic runs through the whole process of primary school students' learning mathematics and is an essential mathematical skill for primary school students. The ability of verbal calculation directly affects the math scores of primary school students and is a basic skill that must be mastered. Primary school mathematics is based on laying a good foundation, and calculation is the most important thing. Many students have poor computing skills, so their math scores are not ideal. Calculation is the foundation and key of primary school mathematics. Parents and I often report that children are not good at calculation, and they are often prone to mistakes. Obviously, the steps and problem-solving methods are correct, and the result of the last step is miscalculated and many wrong points are lost. In the final analysis, we still need to practice more questions.