2. Method
This study was performed with second-grade elementary students in Konya. Participants were chosen as experiment groups, which had 31 students in each, and a control group, which contained 30 students. Experiment groups received the problem-solving strategies training two hours per week out of normal classroom time for a total of 14 weeks in addition to math curriculum. Meanwhile, the control group received traditional problem-solving strategies activities. Two tests, Problem solving I and Problem solving II, were developed by the researcher to be consistent with the aim of the research. These tests are in written format and contain
open-ended questions related to problem-solving strategies. Problem solving test I was applied in the middle, while problem solving test II was applied at the end of the research to the experiment and control groups in the same conditions. Additionally, qualitative interviews were performed with the students to provide explanation describing their solutions, strategies
they used and their thoughts while solving the problems. Data of this study was analyzed by descriptive statistics and the t-test.