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Differences in Mathematics and Science Achievement by Grade 5 and Grade 8 Student Economic Status: A Multiyear, Statewide Study. GJHSS [Internet]. 2017 Oct. 17 [cited 2026 Aug. 6];17(H5):15-26. Available from: https://socialscienceresearch.org/index.php/GJHSS/article/view/2332