Low participation and weak learning motivation often hinder students’ progress in advanced mathematics. This classroom action research investigated whether Problem-Based Learning (PBL) supported by online learning media could enhance Grade XI students’ learning activity and motivation at SMA Negeri 1 Malang, Indonesia. Quizizz and Wordwall served as platforms. Thirty-five students in class XI-3 participated in two cycles (planning, action, observation, reflection), each comprising two meetings. Data were collected through structured observations of activity and motivation, a motivation questionnaire, and a learning-implementation checklist, and were analyzed descriptively using percentages. Results showed consistent gains from Cycle 1 to Cycle 2: activity increased from 72% to 86%, observed motivation from 70% to 85%, and questionnaire motivation from 74% to 89%. The overall average rose from 75% to 87%, exceeding the success criterion (≥76%).
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