This study examined the predictive relationship of a brief computation measure administered in the fall, winter, and spring of first, second, and third grade with the mathematic portion of a state-mandated academic achievement test administered in the spring of third grade. The relationship between mathematical achievement and resource availability and sex was also explored. Multiple linear regression analysis and Pearson correlations indicate the brief computation measure from the winter of first grade through the spring of third grade has a strong predictive relationship with mathematical achievement on the state-mandated academic achievement test administered in the spring of third grade. The brief computation measure in the fall of first grade had a moderate predictive relationship with outcomes on the state-mandated math assessment in third grade. Sex was not found to be an adequate predictor variable. Resource available was a weak predictor of mathematical outcomes, but became more relevant in third grade. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]