With only 40% of students proficient in math by 4th grade, the U.S. faces an acute need to scale innovative approaches to help close the math achievement gap. Closing this gap is particularly critical in order to support effective Science, Technology, Engineering, and Mathematics (STEM) learning and prepare the future workforce for twenty-first-century careers. Yet there remain few evidence-based and engaging digital learning resources to accelerate early math learning. To address this need, a cluster randomized controlled study was conducted to evaluate the impact of Age of Learning's My Math Academy, a digital math program for young learners. The researchers in WestEd's STEM Program analyzed and worked with Age of Learning to interpret the data. This was the first study to evaluate the impact of Age of Learning's My Math Academy app on students' math learning in kindergarten classrooms. Using rigorous methods, students who used My Math Academy were found to have significantly greater growth in their math knowledge than their control group peers. Notably, these accelerated gains were found with relatively little time spent on the intervention: an average of 5.2 hours of usage in total or about 30 minutes per week over the course of 12-14 weeks.