Math programming that includes assessments to predict standardized mathematics scores can help evaluate student performance and growth during the academic year. ACALETICS® is a highly interactive, culturally inclusive mathematics program that utilizes posttests as continuous comprehensive assessments to evaluate student mathematical knowledge. ACALETICS® also seeks to mitigate demographic student factors that may influence outcomes. However, the ACALETICS® posttest has not been examined to determine if it is predictive of standardized mathematics scores. The purpose of this research is to explore how much variance is accounted for by the ACALETICS® posttest scores with the Florida Standards Assessment Mathematics test scores among 427 racially diverse and economically disadvantaged urban elementary school students after controlling for gender, grade level, and race. Findings indicated that the ACALETICS® posttest significantly explained variance in standardized mathematics scores among a diverse sample and can be used as a tool to monitor and predict mathematics outcomes.