Mathematical thinking method is the basic foundation for students to know things and learn mathematics, the core of students' mathematical literacy, and the guiding ideology and basic strategy for dealing with mathematical problems. It is gradually understood with the development of students' knowledge and thinking, and the perception of mathematical thinking method is accumulated in students' mathematical activities. Only when students actively participate in teaching activities, through independent thinking and cooperative communication, can they gradually understand mathematical thinking methods.

1. Infiltration of function thought: In the process of statistical measurement data, filling in forms, observing and discovering the relationship between circumference and diameter, let students experience the change of diameter, the change of circle size and circumference, while their multiple relationship remains unchanged, so as to feel the function thought.

2. Infiltration of transformation ideas: For example, in the process of deriving the area formula of a circle, students are guided to transform the circle into the learned figures such as rectangle, triangle and trapezoid, and the area formula of the circle is derived by using the area formula of the old figure. Let students fully feel the transformed mathematical thought.

3. Infiltration of extreme thoughts: Experience the process of cutting a circle with the help of computers: Let students feel from the senses that "if you cut and make up, you will lose little, if you cut and cut, you can't cut it, then it will fit the circle and nothing will be lost." So as to feel the limit of mathematical thinking.