When teaching the understanding of circle, teachers help students to correctly establish the concept of circle through student-student communication, teacher-student interaction, image perception and abstract generalization, and then point out that circle is a closed figure formed by countless scattered points in an orderly, symmetrical, harmonious and unified arrangement, which embodies a great spirit, that is, the spirit of collectivism. Teachers use vivid language to naturally infiltrate collectivism education into round understanding teaching, and cultivate students' collectivism spirit of unity and cooperation.
When revealing the concept of pi, the teacher introduced that as early as 1500 years ago, Zu Chongzhi calculated pi between 3. 1.4 1.5926 and 3. 1.4 1.5927, earlier than foreigners. This is a great contribution of the Chinese nation to the history of world mathematics, which makes students feel that they are one.