Implementation of the Problem Based Learning Model to Improve the Mathematics Learning Outcomes of Class VIIIA Students at SMPN 2 Gunung Toar

This study was conducted in response to the low mathematics achievement of class VIIIA students at SMPN 2 Gunung Toar, particularly in probability. The problem was related to limited student participation, teacher-centered learning activities, and students’ reluctance to ask questions when facing difficulties. This study aimed to improve the quality of classroom learning and students’ mathematics achievement through the implementation of the Problem Based Learning (PBL) model. This research employed a collaborative Classroom Action Research approach conducted in two cycles, with each cycle consisting of planning, action, observation, and reflection. The participants were 20 students of class VIIIA at SMPN 2 Gunung Toar during the first semester of the 2025/2026 academic year. Data were collected through observation sheets, mathematics achievement tests, and documentation. The results showed that PBL promoted a more active and learner-centered learning process through discussion, investigation, presentation, and collaborative problem solving. Students’ mathematics achievement also improved gradually, with learning completeness increasing from 45% (9 students) in the preliminary stage to 60% (12 students) in Cycle I and 80% (16 students) in Cycle II. These findings indicate that PBL can improve the learning process and mathematics achievement in probability learning.