"IXL Learning" contracted with Empirical Education to study the effectiveness of "IXL Math" in Beaverton School District. During the 2011-2012 year, "IXL Math," an interactive, cloud-based practice environment, was used to supplement instruction in two elementary/middle schools. This study focused on 4th and 5th grade students in Title I schools, and examined the relationship between being in an "IXL Math" classroom and performance on the Oregon Assessment of Knowledge and Skills (OAKS) math test. This study investigated the following questions: (1) Do students in "IXL Math" classrooms perform better on the OAKS math test than comparable students who were not in "IXL Math" classrooms? (2) Is the impact of "IXL Math" different for students with different characteristics? (3) Are differences in "IXL Math" usage associated with differences in student performance? This study also investigated the following secondary question. (4) Do teachers perceive changes in students' attitudes towards math since using "IXL Math"?