This experimental research aimed to know the effectiveness of cooperative learning of TPS tipe interm of student’s mathematical conceptual understanding.  The population of this research was all grade 7th students in second semester of SMPN 8 Bandarlampung as many as 366 students that were distributed into 12 classes, with two classes as a sample of the research which was taken by using the random technique.  This research was quasi experiment with posttest control design.  Research instrument was concept comprehension test and data analysis technique by using t-test. The result of research and discussion, the mathematical conceptual understanding cooperative learning by using of TPS tipe more than effective of mathematical conceptual understanding by using of conventional learning.

Keywords   : cooperative learning, TPS, understanding of mathematical concept.