<![CDATA[Mathematical concept understanding is an important skill that students need to have in the mathematics learning process, because it plays a role in helping them understand and relate various concepts learned. However, learning that is still dominated by lecture methods often causes students to be less active in learning, resulting in low conceptual understanding. The purpose of this study was to determine the improvement in students' mathematical concept understanding abilities through the application of the Think Pair Share learning model assisted by Mystery Box media on the material of flat-sided solid shapes. This study used a quasi-experimental approach with a Nonequivalent Control Group Design. The research subjects consisted of 35 eighth-grade students in the experimental class and 37 students in the control class. Data collection techniques used tests in the form of pretest and posttest questions. Data were analyzed using normality tests, homogeneity tests, independent sample t-tests, and N-Gain calculations. The results showed that there was a significant difference between students' mathematical concept understanding abilities in the experimental class and the control class with a significance value of 0.000 <0.05. In addition, the average increase in scores in the experimental class was 21.8, higher than the control class of 10.22. The N-Gain analysis result in the experimental class was 0.4368, which is in the moderate category. Therefore, the implementation of the Think Pair Share learning model assisted by the Mystery Box can improve students' mathematical concept understanding in the material of flat-sided solid shapes.]]>
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