This study is motivated by the low learning outcomes of fifth-grade students (class VA) at SD Negeri 18 Kampung Baru, Padang City, which are caused by the suboptimal implementation of innovative learning models by teachers, learning that is not yet game-based and less challenging, the absence of group-based learning, and teacher-centered instruction that makes the learning process less enjoyable for students. This study aims to describe the improvement of students’ learning outcomes in the topic of Plane Figure Perimeter through the implementation of the Team Games Tournament model assisted by Baamboozle. The method used in this study is Classroom Action Research (CAR) with qualitative and quantitative approaches conducted in two cycles, consisting of planning, implementation, observation, and reflection stages. The results show an improvement in mathematics learning outcomes from cycle I to cycle II, where the average score of lesson module assessment in cycle I was 93.74 (Very Good) and increased to 98.43 (Very Good) in cycle II, the teacher’s implementation aspect score in cycle I was 83.92 (Good) and increased to 96.42 (Very Good) in cycle II, and students’ learning outcomes in cycle I with average scores of attitude 75.61 (Fair), skills 77.62 (Fair), and knowledge 75.60 (Fair) improved in cycle II to average scores of attitude 85.17 (Good), skills 86.10 (Good), and knowledge 86.29 (Good). Thus, it can be concluded that the implementation of the Team Games Tournament model assisted by Baamboozle is effective in improving students’ learning outcomes on the topic of Plane Figure Perimeter in class VA at SD Negeri 18 Kampung Baru, Padang City
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