Özet:

Abstract This study aims to investigate the effect of cooperative learning approach on the 6th grade students’ achievement in the field of mathematics. The research study was designed based on the pre-­‐‑and post-­‐‑test control group experimental model. The study was carried out with a total of 56 students at a secondary school of Ministry of National Education in the city center of Siirt in the spring semester of the academic year 2014-­‐‑2015. One experimental group and one control group was used in the research. The study duration was 4 weeks. During this period, the lessons were taught based on the cooperative learning approach with the experimental group. For the control group, the traditional learning approach was used. As a data collection tool, a “field test” developed by the researchers was administered to both the experimental group and control group as a pre-­‐‑ and post-­‐‑test. Furthermore, experimental group students'ʹ opinions about the cooperative learning approach were elicited through an open-­‐‑ended semi-­‐‑structured interview form at the end of this process. Data analysis was done with the SPSS 21 statistical program, and the statistical processes used in the data analysis included t-­‐‑test, mean, standard deviation, frequency and percentages. The significance level was .05. A significant difference was found for the experimental group between the post-­‐‑test achievement scores of the students who were exposed to cooperative learning approach and the students in the control group who were exposed to traditional learning approach. Also, comparing the access points of the students both in experimental and control groups, a significant difference for the experimental group was found. At the end of the experimental study, the students in the experimental group expressed that having lessons according to the cooperative learning approach was useful, they understood the importance of collaborating with their friends, the tournaments were exciting and fun.

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