This study examined the conditional direct and indirect effects of kindergarten math skills on fifth-grade math achievement varying at levels of kindergarten reading proficiency. Participants were 18,174 kindergartners in the Early Childhood Longitudinal Study, Kindergarten Class of 2010–2011. Results show that kindergarten math skills had stronger direct effects on fifth-grade math achievement than kindergarten reading skills. There were unequal effects of kindergarten math skills on fifth-grade math achievement depending on the levels of kindergarten reading skills in that the effects were more pronounced for those with weaker kindergarten reading proficiency and diminished as reading skills advanced. The effects of kindergarten math skills on fifth-grade math achievement were through working memory, and the mediating effects were uneven across different kindergarten reading skills but stronger for children with weaker kindergarten reading skills. Therefore, less proficient readers in fall kindergarten exerted more from spring kindergarten math and working memory when addressing fifth-grade math problems. Findings suggest that the effects of kindergarten math skills on fifth-grade math success were not uniform across different levels of kindergarten reading skills and reading held a critical role in math success. Future studies should explore whether there are disproportionate effects of initial math skills on later math achievement varying by racial and socioeconomic backgrounds resulting in math disparities. Intervention programs intended to improve math performance to narrow the racial and socioeconomic disparities should include reading comprehension and reasoning.
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