<![CDATA[This research is motivated by the low ability of elementary school students to understand mathematical concepts. One alternative learning model that can be applied to address this issue is the Teams Games Tournament (TGT) model. This study aims to determine the effect of the TGT learning model on students' mathematical concept understanding. A quantitative approach with a quasi-experimental method and a Nonequivalent Control Group Design was employed. The research subjects consisted of 40 third-grade students from SDN Indragiri 2, divided into experimental and control groups. Data were collected through tests, observations, and documentation, then analyzed using normality tests, homogeneity tests, Independent Sample t-test, N-Gain, and Effect Size. The results indicated that the data were normally distributed and homogeneous. The Independent Sample t-test yielded a significance value of 0.000 < 0.05, indicating a significant difference between the two groups. The experimental group's average N-Gain score (61.49) was higher than that of the control group (38.61). The Effect Size analysis also demonstrated a strong influence of the TGT model. Therefore, the TGT model is effective as an alternative learning approach to enhance elementary students' mathematical concept understanding.]]>
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