Cooperative learning is an active teaching method that promotes creativity, communication and cooperation skills of students. Current teaching practices in primary schools show that many teachers have been using cooperative learning, but the organization is still formal and ineffective, so the effectiveness of this teaching method has not been fully promoted. The content of the article proposes steps to apply cooperative learning in teaching Math 1 to form and develop competencies, especially mathematical communication competencies according to the 2018 general education program.