This study aimed to determine the effect of the Teams Games Tournament (TGT) learning model assisted by Geoboard media on the mathematics learning outcomes of second-grade students at SD Negeri Lamsayuen Aceh Besar on the topic of plane figures. This study employed a quantitative approach with a quasi-experimental design. The sample consisted of 36 students divided into an experimental class and a control class. Data were collected through learning outcome tests and analyzed using the Mann-Whitney U test. The results showed that the average score of the experimental class was 95.5, higher than the control class at 56.25. The hypothesis test showed a significance value of 0.000 < 0.05. It can be concluded that the TGT learning model assisted by Geoboard media had a significant effect on students’ mathematics learning outcomes.
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