This study aims to determine the effect of the TGT learning model assisted by jellyfish game media on students' mathematical concept understanding abilities. This research was conducted at SDN 1 Balai Murni Jaya. This research is quantitative. This type of research uses pre-experimental design. The population in this study were all III class students consisting of 2 classes, namely class III A with 23 students and III B with 22 students. The sampling technique used purposive sampling. The sample in this study was III A with 23 students. The research design used was one group pretest and posttest. The data collection technique used in this study was a test. The test in this study was an essay test consisting of 8 questions. Based on the results of the hypothesis test using the paired sample t test, it can be seen that sig. (2-tailed) 0,000 <0,05. Thus, it can be concluded that there is an influence of the TGT learning model assisted by jellyfish game media on students' mathematical concept understanding abilities.
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