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This study utilized propensity score matching to examine the acute effect of OST STEM on the mathematics achievement of Black students. A sample of students (N = 3,763) was extracted from the HSLS09/12 for this study. After propensity score matching, a univariate analysis of variance (ANOVA) was conducted. The mean effect of participation in OST STEM was d = .18. This is important because the effect size data suggest that Black students who participate in STEM-focused OST activities will on average score higher in mathematics than approximately 60% of Black students who do not participate in these activities. The study contributes to the literature on Black student achievement, OST STEM, and the influence of mathematics dispositions on educational outcomes.