This research issue is whether there is influence of problem-based learning model for mathematical problem solving ability of students grade XI IPA MA Negeri 1 Lubuklinggau ?. The method used is a true experimental design were carried out with the comparison group. The study population was all students in grade XI IPA MA Negeri 1 Lubuklinggau, which consists of 113 students. As an experimental class is a class XI IPA 3 as many as 36 students and a control class is the class XI IPA 2 were 38 students randomly selected. Data collected by the testing techniques in narrative form. Data were analyzed using t-test. Based on the results of t-test analysis on the level of significance α = 0.05, obtained t_hitung (6.80) > t_tabel (1.671), so that it can be concluded there is the influence of problem-based learning model for mathematical problem solving ability of students grade XI IPA MA Negeri 1 Lubuklinggau.
Keywords: Problem Based Learning, Problem Solving Ability Mathematics