Özet:

The aim of this study was to determine the effect of the problem-based learning method on students’ academic achievement in mathematics lessons. A pre-test post-test control group experimental design was used to obtain the data of the study. The study was conducted in the 2021–2022 academic year in two classes, consisting of experimental and control groups, in Şarkikaraaaç Science High School in Isparta. Data were collected through an achievement test in the study. To prepare the achievement test, the objectives were determined, inserted into the table of test specifications, and expert opinion was obtained. Expert opinion was also obtained about the content validity. The overall reliability coefficient of the measurement tool was found to be 0,91 as KR-20. Descriptive statistics and independent and dependent group t-tests were used to analyse the data. According to the results of the research, it can be said that the problem-based learning method implemented in the 10th grade mathematic lessons improved the academic achievement of the students.

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