In the research, process of problem solving and its teaching was taught as a subject during the 13 weeks (26 hours). At
the beginning of the term, problem solving strategies were taught to the students for two hours. After that, two problems
and mathematical thinking scales were applied. At the end of the 13th week, the same problems and scale were applied
again. In the course of the term, various problems were solved and some practices were made.
In the analysis of the data obtained, we tried to determine whether the students employed the problem solving stages in
the solutions of the problems. In the problem solving stages, we examined the processes of understanding the problem,
being able to select and apply the involved strategy, and being able to evaluate it. In the study, we attempted to
determine whether the students solved the given problem using problem-solving stages and to specify their
mathematical thinking levels.