In teaching Mathematics, teaching skills is extremely important. With skills, new students can solve problems quickly and accurately. In fact, in order to achieve high efficiency in Math lessons, it is not enough to exchange between teachers and students, but more exchanges between students are needed. One of the skills that help them meet the requirements is cooperation skills. Cooperation skills are expressed in the ability to work effectively individually for individuals, individuals for groups, in relationships of mutual help and support. In this article, we propose a process to train primary school students’ cooperative skills in teaching Mathematics to improve the quality of teaching and learning. Keywords: Cooperation skills.