<![CDATA[This study is prompted by the low level of mathematics learning achievement in class IX.10 students at MTsN 1 Kota Padang, due to insufficient student activity and engagement within the teaching and learning process. This study is conducted to enhance students’ mathematics learning achievement through the application of the Student Teams Achievement Divisions (STAD) cooperative learning model. This study adopts a Classroom Action Research (CAR) design implemented in two cycles, each comprising planning, action, observation, and reflection stages. This study involved 30 students from class IX.10 in the odd semester of the 2025/2026 academic year. The data collection tools comprised observation sheets for monitoring teacher and student activities and learning outcome tests administered at the end of each cycle. The results demonstrated a meaningful improvement in students’ learning outcomes. In the pre-cycle, the average student score was only 74.06 with a low classical completeness percentage. After implementing the STAD model, the average learning outcome increased to 78.50 in Cycle I and reached a higher increase of 82.40 in Cycle II, with the classical completeness level meeting the success criteria. This improvement was also accompanied by changes in student behavior, becoming more active, enthusiastic, and responsible in group work. The findings suggest that the application of the STAD cooperative learning model is effective in improving mathematics learning outcomes for class IX.10 students at MTsN 1 Kota Padang.]]>
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