This study aims to determine the contribution of the use of cooperative learning method in the 7th grade mathematics course on students' academic achievement in mathematics, attitudes towards mathematics and critical thinking dispositions. This study was conducted with 40 students in Anamur district of Mersin province in Türkiye in the 2020-2021 academic year. The study was conducted with a quasi-experimental design and collaborative teaching methods (Student Teams-Achievement Divisions and Team-Game-Tournament technique) were applied in the experimental group, and the activities in the Ministry of National Education middle school mathematics curriculum were applied in the control group. The data collection tools used in the study were the "Achievement Test" developed by the researchers, the "Attitude Towards Mathematics Scale" developed by Önal (2013), and the "Critical Thinking Disposition Scale" adapted into Turkish by Kılıç and Şen (2014). The study revealed that the academic achievement of the students in both groups increased significantly, attitude towards mathematics scores decreased significantly in the experimental group students and increased insignificantly in the control group students, and critical thinking disposition scores decreased insignificantly in the experimental group and increased significantly in the control group.