Early exposure to language supports number concept development: Insights from deaf children acquiring signed and spoken language.

Children's numeracy skills at school entry predict future educational attainment. Deaf and hard-of-hearing students are reported to underperform compared with typically hearing peers in mathematics. This study examined the impact of language experience on cardinal principle (CP) knowledge and accuracy in generating large sets in 58 hearing and 120 deaf and hard-of-hearing children ages 3.1-7.6 years who were learning spoken English and/or American Sign Language (ASL). The 178 children represented diverse racial, ethnic, and socioeconomic backgrounds; 77 were assigned male at birth. Logistic regression models showed that chronological age and age of access to language significantly predicted CP knowledge; however, age of language access was no longer significant after including highest count as a predictor. Logistic regressions further revealed that age and the timing of children's access to language (early/later)-but not language modality or socioeconomic status-significantly predicted accuracy in generating large sets. After including the age at which children began receiving greater access to language, both highest count and language access, along with age, significantly predicted performance. These findings show that both ASL and spoken English support number knowledge development and CP acquisition and that early exposure to accessible language is critical to promoting equity in mathematics outcomes.