In this supplement, the cost to implement and operate the Dana Center Mathematics Pathways (DCMP) program across the participating colleges is presented separated into primary cost categories based on program components describing what portion of spending went to training, teacher time in class, teacher time outside of class, advisement, technology, curriculum materials, and general administration. These costs are shown in Supplement Table 1 for the start-up phase. In addition to costs incurred by the college, costs incurred by the Dana Center are quantified in Supplement Table 2. The ongoing cost of the intervention to colleges was calculated based on an estimation of DCMP program costs, the cost of the traditional developmental math sequence, and the cost of college credits attempted. These resources include direct instructional costs, as well as the usual advising services, administration, and other student services. The ongoing costs for the operation of the program during one academic year are presented in Supplement Table 3.