Learning mathematics from middle school textbooks should proceed from the actual situation of students. Compared with the basic knowledge of mathematics, mathematical thinking method has a higher status and level. Mathematical knowledge is the content of mathematics, which can be recorded and described by words and symbols. As time goes on, memory declines and may be forgotten in the future. Mathematical thinking method is a kind of mathematical consciousness, which can only be understood and applied and belongs to the category of thinking. It is used to understand, deal with and solve mathematical problems and master mathematical thinking methods. Not for a while, but for a lifetime. Even if the knowledge of mathematics is forgotten, the mathematical thinking method still works for you.