The purpose of this study was to examine the story behind one young deaf child who demonstrated exceptional early mathematical competence and the individual and family characteristics that might have contributed to his success. As an outlier, this child achieved a score on a test of early mathematical ability that was two standard deviations higher than the next highest score. Using qualitative methodology, this study examines factors that may have contributed to this child's early mathematical success including family, home, and individual learning behaviours such as engagement, resilience, curiosity, and challenge seeking. Findings indicate that there is value to examining the story behind outlier scores and that multiple factors are likely to contribute to success.