This study employs a quasi-experimental approach, utilizing a posttest-only control group design, to investigate the applicability of implementing "two stay-two stray" learning with a contextual approach to enhance the mathematical understanding of class XII students at SMK Negeri 1 Cimahi. The participants in this research consist of class XII students, totaling 34 students each, distributed into control and experimental groups, each subjected to different teaching methods. The research utilized a mathematical understanding ability test as the instrument, with subsequent data analysis carried out using the SPSS Statistics software. The data analysis reveals significant differences in mathematical understanding abilities between students who underwent "two stay-two stray" learning and those who were taught using conventional methods. The t-test yielded an average score of 81.02 with a significance level > 0.05, indicating normal data distribution.
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