Based on an ethnographic study, we explore the potential of experimenting with multiple languages for number words as part of young children's mathematical activity. Data from a preschool classroom activity on "number words in 'other' languages" exemplify a complex process of discursive identity-work and dialogism amongst children, parents, teacher, and researchers. The focus is on the case of little Mariah, a Pakistani immigrant girl in Greece, who experiences participation by sharing number knowledge in her mother tongue Urdu, and highlights how gendered, racial, or language-related discourses weave her learner identity in a multilingual preschool classroom.