"Double reduction" refers to effectively reducing the excessive academic burden and off-campus training burden of students in compulsory education.

"Peer-to-peer learning * *" is a learning group composed of 4-6 students, who participate in classroom activities, cooperate in division of labor and actively communicate, thus increasing teachers' participation in intra-group communication, aiming at completing the learning task of * * *, promoting the all-round growth of members and teachers' own progress, emphasizing interactive learning guidance in the learning process and sharing various learning experiences through interpersonal communication, communication and sharing. "* * * the same body" means paying more attention to training, rather than being a mere formality or simply assigning tasks. The key point is to emphasize interpersonal communication and play a group dynamic role in learning.

The research purpose of the project "Practical Research on Junior Middle School Mathematics Learning * * * Training under the Background of Double Reduction" is to actively promote the reform of classroom education and teaching, and carry out a series of targeted mathematics teaching activities based on learning * * * training (a relatively fixed study group) to cultivate students' cooperation ability and communication ability, so that every member can join in and reduce students' anxiety. At the same time, appropriate group learning evaluation is also carried out, so that the learning group has both pressure and motivation, lays a quality foundation for future study and work, and is good at expressing and sharing.