1. Create a relaxed and harmonious learning environment for students. Effective classroom teaching should have a relaxed and harmonious learning atmosphere, so that students can have rich emotional experience in the process of exploration and learning. A relaxed and harmonious environment does not mean that it can only be achieved through games or vivid situations. Teachers' vivid language, friendly attitude, inspiring and creative questions and exploratory activities can create a harmonious environment for students. 2. Pay attention to students' learning process and let them experience the opportunity to do mathematics. Mathematics learning, especially the learning of new concepts and methods, should provide specific situations for students to experience mathematics in actual operation, arrangement, analysis and exploration. For example, when exploring and discovering the sum of the internal angles of a triangle, I provide students with a record of group activities, so that students can measure the angles of the three angles of the triangle themselves and communicate the discovery rules in the group. After discovering the rules, guide the students to tear and fold the paper to verify their findings. In the whole process, I fully let students experience mathematical activities such as operation, verification and communication. I let students not only learn knowledge, but also experience the fun of "doing" math. Because they have experienced the practice of guessing and verifying, they have a deep memory of this knowledge and are more interested in mathematics learning.