Reading comprehension skill is one of the four basic language skills in native language teaching, but it is very important not only for the development of native language but also for the success in other lessons. In this study, the purpose of which was to determine the effect of reading strategy education on problem solving skills in mathematics lessons, a quasi-experimental design with pretest - posttest control groups were used. By getting the necessary permissions from the relevant places, the research was carried out with two 6th grade classes of a secondary school in Ankara in the 2017-2018 academic year. Two 6th grade classes whose class sizes and math and Turkish courses’ academic achievements were equal and Turkish and mathematics lessons were taught by the same teachers were chosen; one of these classes was determined as the control group and the other as the experimental group through random method. In the study, while  activities prepared according to reading strategies were applied to the experimental group, the lessons in the control group were carried out with the activities in the textbook. The application study was completed in ten weeks. As a result of the research, it was determined that mathematical problem solving achievement test scores of the experimental group students, who were provided reading strategy education, were higher than the MPSAT scores of the students in the control group. It was concluded that after ten weeks of application, mathematical problem solving skills of students in the experimental group have developed.