Structural teaching method pays attention to the comparison and connection between old and new knowledge. He never worries about whether the students' brains are enough. For example, when teaching the proof of the triangle interior angles and theorems, the textbook just extends the bottom of the triangle and makes parallel lines on one side to guide the students to prove, while Sun Weigang gives the questions to the students, asking them to guess what the sum of the triangle interior angles is, and then asking the students to prove themselves.

After several proofs came out, Sun Weigang asked "What is the sum of the interior angles of a polygon", and the students answered "(n-2) 180", and wrote several proofs on the blackboard. Sun Weigang made a summary-this is the idea of mathematical induction.

Mathematical induction is something that I only came into contact with in grade two, but the first-year students who find the sum of the inner angles of triangles will know it. Is it tolerable to teach students this way? But learning from Mr. Sun will make your brain "strong".

Extended data:

Brief introduction of mathematics teaching methods in primary schools in Sun Weigang;

1. Teaching method: It is a way for teachers to systematically impart knowledge to students through oral language. The basic form of teaching method is that teachers speak and students listen. Specifically, it can be divided into three ways: telling, reading and explaining. Its advantage is that students can acquire a large amount of systematic knowledge in a short time, which is conducive to giving full play to the leading role of teachers and helping teaching activities to be carried out purposefully and planned.

2. Heart-to-heart method: It is a teaching method that teachers guide students to acquire knowledge through thinking activities such as analysis and judgment by oral question and answer according to students' existing knowledge and experience. Its advantage is that it can fully stimulate students' active thinking, promote students' independent thinking, play a positive role in the development of students' intelligence, and also help students to exercise and improve their language expression ability.

3. Discussion method: Under the guidance of teachers, students express their opinions and exchange views around a certain issue, and acquire knowledge through mutual inspiration, discussion and consultation. Its advantage is that students with similar age and development level discuss with each other, which is easy to stimulate interest and active thinking, help to listen, compare and think different opinions, and on this basis, think independently and promote the development of thinking ability.