This report presents findings from the Prekindergarten Transmedia Mathematics Study. The study examined whether a PBS KIDS transmedia mathematics curriculum implemented by teachers in early learning centers could positively affect children’s math skills. The study found that to be the case—children learned significantly more math, and teachers expressed both greater comfort with technology and more confidence in their math teaching. The report is part of a seven-year series of studies conducted by EDC and SRI International to measure children’s learning outcomes under the Ready To Learn initiative. This initiative, supported by the US Department of Education, has allowed the Corporation for Public Broadcasting and PBS to develop media-rich literacy and math learning resources for young children, with the goal of improving school readiness among preschoolers in high-need communities.