The aims of this study were to investigate the effects of cooperative learning on the mathematics ability and cooperative social behaviours of kindergarten children and to evaluate teachers' perspectives on the application of the program. One control (n = 17) and one experimental group (n = 17) were studied. In the experimental group, a curriculum based on cooperative learning method activities was used. Significant improvements in mathematics abilities were found for children in the experimental group that utilised cooperative learning. (Contains 3 tables.)