<![CDATA[This study aims to determine the effect of the Student Teams Achievement Division (STAD) cooperative learning model assisted by Wordwall on the mathematical problem-solving abilities of eighth-grade students of St. Yoseph Catholic Private Junior High School Medan in the 2025/2026 Academic Year and the improvement of students' mathematical problem-solving abilities after the model is implemented. This study uses a quantitative approach with the Pre-Experimental Design method using the One Group Pretest-Posttest Design. The research sample consisted of 36 students. Data analysis used normality tests, Paired Sample t-Test, and N-Gain. The results showed that the average pretest score of 50.806 increased to 80.167 in the posttest. The results of the hypothesis test obtained tₕᵢₜᵤₙg = 53.303 and tₜₐᵦₑₗ = 2.030, so that H₀ was rejected and Hₐ was accepted. The N-Gain test results obtained an average of 0.611, categorized as moderate. Thus, it can be concluded that the Student Teams Achievement Division (STAD) cooperative learning model assisted by Wordwall has a significant effect and is able to improve students' mathematical problem-solving abilities. ]]>
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