2. Guide students to think of another group when they see one group through association.

3. Let students improve their observation ability and hands-on operation ability in participating in learning; Enhance the awareness of teamwork and communication.

Create situations and explore new knowledge.

1. Create a situation (courseware demonstration). 2. Hands-on operation and explore new knowledge. 3. Group discussion to consolidate new knowledge.

1. Teachers and students hold digital cards until grade 8. (For example, the teacher mentioned 1 and the students mentioned 7. )

2. Two people at the same table are gesticulating with the composition of 8.

3. Fill in the blanks.

This lesson is based on the understanding of 8 and 9. When introducing the new curriculum, I adopted the creation of life situations to make students think, with the aim of making students fully feel that mathematics is around us and stimulating students' interest in learning by asking questions. In the process of exploring knowledge, based on the principle of taking students as the main body and teachers as the leading factor, I changed from a single teacher to a group cooperative learning, discussion and hands-on operation, and then carried out teaching.