The aim of the study is to investigate the effects of Student Teams-Achievement Divisions (STAD) and Teams-Games-Tournaments (TGT) techniques of cooperative learning on students' academic achievement, retention and social skill levels in mathematics lesson. The study which was applied on 152 students in an elementary school in Adana in 2009-2010 academic year was a semi-experimental study and lasted in eighteen weeks. There are two experiment groups and a control group in the study. There are fifty two students in the STAD group. There are fourty eight students in the TGT group. There are fifty two students in the control group.