This paper examines the prevalence of incomplete educational qualifications and consider the importance of both background characteristics and numeracy skills as predictors of non-completion. The paper analyzes data from the Program for the International Assessment of Adult Competencies (PIAAC) to address the following research questions: "How does not completing educational qualifications vary by numeracy proficiency levels?" "Which background characteristics are related to not completing educational qualifications?" "Do relationships between background characteristics and non-completion vary by numeracy proficiency levels?" Findings show that adults with high numeracy proficiency are more likely to drop out of degree or certificate programs without completing new qualifications, while less-educated adults are not only underrepresented in degree or certificate programs, but they also have much higher odds of not completing those qualifications.