Quantway is a Carnegie Math Pathways initiative which redesigns the content, pedagogy, and structure of traditional developmental math courses to simultaneously tackle traditional barriers of student success and support a broader range of developmental students in achieving their math potential. Specifically, Quantway is a quantitative reasoning sequence that is comprised of a single term developmental math course called Quantway 1 and a college-level math course called Quantway 2. This study assessed the effectiveness of the developmental math course, Quantway 1, between the spring of 2012 and the fall of 2014. A hierarchical linear modeling technique was used to conduct propensity score matching across 37 student characteristics in order to compare the course performance of Quantway 1 students with matched comparison students in traditional developmental math courses. Quantway 1 students demonstrated significantly higher odds of success than matched comparison students in fulfilling developmental math course requirements. Additionally, Quantway 1 effects were positive across all sex and race/ethnicity subgroups as well as in nearly all classrooms and colleges. This study provided robust evidence that Quantway 1 increases student success in fulfilling developmental math requirements and advances equity in student outcomes. Directions for future work are suggested.