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This research aimed to determine that improving the mathematical problem solving ability of students through the PBL model is better than traditional learning. This research is a quasi experimental research. Sampling method is using random sampling method that is from tenth grade at State Senior High School 7 of Medan selected two classes as sample which subjected to random treatment of one as control class that is X2 and the other as experimental class that is X5. Eksperimental class is using PBL model and control class is using traditional learning. Inferensial statistic analysis was performed by Independent Sample t-Test. The math subject is system of linear equations with two variables. Based on the research, it was found that the significance value for mathematical problem solving ability in the experimental and control classes is 0.00. Because 0.00 < 0.05 then H0 is rejected, So improving the mathematical problem solving ability through the PBL model is better than traditional learning. It was concluded that improving the mathematical problem solving ability through the PBL model is better than traditional

Improving Students Ability in Mathematical Problem Solving Through Problem Based Learning Model in Tenth Grades State Senior High School 7 of Medan