In addition, due to the limitation of reading ability, primary school students can't distinguish easily confused words such as "add" and "add to", which leads to the wrong interpretation of the meaning of the question, thus affecting the correct rate of solving problems. When assigning exercises, teachers should not copy them completely. They should carefully screen the exercises, or make appropriate adaptations according to the life experience and cognitive level of primary school students. It is necessary to properly guide students to discuss words that students may misunderstand in advance, so that every student can accurately understand the information contained in the topic. Second, primary school students, especially junior three students, are relatively weak in intentional attention and lack patience. Some students have a psychological state of seeking speed in the process of doing their homework, and they are careless when examining questions. In the usual teaching process, we should not only be satisfied with the training of students' problem-solving methods, but should organically combine the cultivation of students' excellent psychological quality with the learning of mathematical knowledge and skills. Cultivating students' patience and meticulous quality is a long-term and arduous task, which requires teachers' persistent efforts. If students develop a good habit of examining questions, their ability to solve problems will be obviously improved.