Analysis of consistent Zearn Math users and a comparable group of non-users in District of Columbia Public Schools (DCPS) shows that students who used Zearn Math consistently had higher levels of academic growth than similar students with low- or no-usage. This analysis used two quasi-experimental methods, Coarsened Exact Matching (CEM) and fixed effects, to examine the impact of Zearn Math across [approximately]1,000 students who completed an average of 3+ Zearn Math lessons per week, during the 2018-2019, 2020-2021 and/or 2021-2022 school years. Findings showed that students who used Zearn Math consistently grew 36% more; the equivalent of 10.5 additional weeks of learning in one school year, as measured by the i-Ready Diagnostic. Students who started two or more years below grade-level had almost 2x the growth with consistent Zearn Math usage as similar students with low or no usage; the equivalent of an additional 23.7 weeks. Consistent Zearn Math usage was shown to result in a 32% reduction in summer slide, equivalent to five weeks of learning over the summer. Students with consistent Zearn Math usage in 2020-2021 maintained almost 75% of their additional growth a year after they stopped using Zearn Math. [The report was published by Zearn.]