<![CDATA[This study was motivated by the low mathematics learning outcomes of third-grade students at SD Negeri 1 Nyuhtebel. Therefore, the implementation of the Student Teams Achievement Divisions (STAD) cooperative learning model assisted by the Wordwall learning media was applied to improve students' learning outcomes. This study aimed to determine the improvement in mathematics learning outcomes through the implementation of the STAD cooperative learning model assisted by Wordwall during the 2025/2026 academic year. The research employed a Classroom Action Research (CAR) design consisting of two cycles, with each cycle including the stages of planning, action, observation, and reflection. The research subjects were 20 third-grade students, consisting of 8 boys and 12 girls. Data were collected through learning achievement tests, classroom observations, and documentation. Data analysis was conducted using descriptive quantitative techniques by calculating the mean score, learning mastery, and students' learning absorption, supported by observational data on students' learning activities. The results showed a significant improvement in students' mathematics learning outcomes. The average score increased from 62.25 in the pre-cycle with 40% classical learning mastery to 74.00 with 65% mastery in Cycle I, and further improved to 89.00 with 90% mastery in Cycle II. In addition, students demonstrated increased participation, collaboration, and learning motivation throughout the implementation of the learning model. It can be concluded that the STAD cooperative learning model assisted by Wordwall is effective in improving mathematics learning outcomes and creating an active, interactive, and enjoyable learning environment. Therefore, this learning model is recommended as an innovative instructional strategy for mathematics teaching in elementary schools.]]>
