The purpose of this causal-comparative study was to use Gagne's cumulative learning theory to compare math curricula choice to Louisiana Education Assessment Program (LEAP) math achievement for third, fourth, and fifth grade students in public schools within the state of Louisiana. The independent variable of interest, math curricula choice, was generally defined as curriculum materials. The dependent variable of interest was third, fourth, and fifth grade math LEAP achievement scores. Studies from diverse researchers, both recent and less recent, suggest different curricula materials can have varying results on student learning (Bhatt & Koedel, 2012; Bhatt et al., 2013; Koedel et al., 2017; Lein Authement, 2022; Polikoff, Petrilli, et al., 2020; Walsh, 2009; White, 2018). Considering the potential value of curriculum materials, the LDOE attempted to leverage curriculum material influence, partially through the aid of a tiered ranking system of Tier 1 through Tier 3, for school use to help inform curriculum material selection to facilitate improvement in student achievement (Kaufman et al., 2018). Information for this study was gathered through LDOE provided data, survey results, and school parishes within Louisiana. A one-way ANOVA was used to compare the means from the different tiers. The findings from this study produced mixed results and support the need for continued persistence within this area of study. Explicitly, more investigation should determine whether the Tier 1 curriculum material's high performance in maintaining the highest average scores for all comparisons with reliable sample sizes for each grade and year of this study, and statistically significant results for higher achievement during the 2017-2018 school year, was a consistent pattern with Tier 1 curriculum materials for other grades and years, other curriculum materials nationwide, or if these results are an irregularity. [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.]