The Effect of Wordwall-Assisted STAD Cooperative Learning Model to Improve Students' Problem-Solving Ability in Two-Variable Linear Equation Systems for Grade VIII Students at SMP St. Yoseph Medan

Abstract

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.