In our country today, mathematics educators have many different approaches to promote the activeness and initiative of students in the acquisition of knowledge. This article will introduce a process for teaching Primitive – Calculus 12 based on social constructivism. With this approach, students participate in creating knowledge for themselves through social interaction activities (group activities) and promote students' self-reliance and self-regulation, dynamic, creative and practice teamwork skills, and cooperative attitude. Moreover, through group discussion activities, students can share knowledge, contributing to filling up the knowledge gap for each student, reducing the level gap between students. Therefore, it helps to improve the quality of education