In this research, it is aimed to put forward the variables that predict the numeracy skills in PIAAC of Turkey, to reveal the relationship between the numeracy skills with educational level, education level of parents, number of books in the household, and annual income. It is also aimed to evaluate the quality of educational outcomes of the Turkish National Education System (TNES). The research is designed in a descriptive-analytical method. The sampling of the study is 5199 households. Mean, t-test, correlation, and CHAID analysis were used in the analysis. In the study, the performance of the numeracy skills of adults in Turkey was found to be very low and, it was emphasized the quality problems of TNES have remained. Moreover, the most powerful predictor of numeracy skills is educational level. There is also a significant relationship between numeracy scores with education level, education level of parents, income, number of books, and computer use. It is expected to provide a new perspective to the policymakers and researchers in education about the appearance of the TNES.