The last big problem of junior high school mathematics in Hainan is to examine students' ability to solve practical problems with mathematical knowledge. The content of the exam often involves many chapters of knowledge, including proportion, graphics, equations, functions and so on. , and the form of questions is mainly applied questions. These application problems may appear in the form of charts, allowing students to calculate and analyze according to charts; It may also appear in the form of words, requiring students to understand and solve practical problems. Therefore, the last big problem is a good comprehensive training for students, which can help students comprehensively consolidate and improve their mathematical knowledge and problem-solving ability.