The purpose of this quantitative ex post facto study was to determine if, and to what extent, differences existed in pre-and-post math scores following the VMath intervention for Title I 6th, 7th, and 8th graders in the Southwestern United States. Three research questions guided this study: (1) is there a statistically significant difference in pre-and-posttest VMath scores for Title I 6th grade students? (2) is there a statistically significant difference in pre-and-posttest VMath scores for Title I 7th grade students? (3) is there a statistically significant difference in pre-and-posttest VMath scores for Title I 8th grade students? The mastery learning model provided the basis for the theoretical foundation to execute this study. Archival data was collected from the participating school, specifically 46 paired (pre-and-post) assessment scores for 6th, 7th, and 8th grade. In addition, the researcher utilized a paired samples t-test to analyze the difference in assessment scores for each grade level and found a significant increase in scores, from pre to post. Specifically for 6th grade, t (45) = 5.98, p < 0.001, d = 0.88, there was a large effect. As for 7th grade, t (45) = 7.62, p < 0.001, d = 1.12, and also had a large impact. Lastly, for 8th grade, t (45) = 5.54, p < 0.001, d = 0.82, similarly to other grade levels, there was a large effect. This study contributed to the literature by examining the VMath program concerning Title I middle school students' math achievement, results indicated that following this math intervention there was a statistically significant mean increase in scores for the post-assessment when compared to the pre-assessment. The results from this study elicited multiple recommendations for future research. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]