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Pedagogical content knowledge (PCK) is a central piece of teachers’ knowledge and associates with effective teaching and student achievements. The present study was undertaken to investigate preschool teachers’ mathematics PCK in a specific domain numbering. One hundred preschool teachers or teacher candidates participated in the study. A scenario-based questionnaire was used, and the data was analyzed by a mix of qualitative and quantitative methods. A preliminary analysis reveals that participants generated diverged responses for the concepts embedded in a game-scenario for which counting-out is the targeted concept, about 76% participants could identify a child’s one-to-one correspondence error, but barely a half could identify the cardinality error, and even less for the counting-out error. Other findings are also discussed.