“…Further, there are many irregularities in the symbolic number system, and infants seldom see or hear three-digit number words (e.g., "518"; Fuson & Kwon, 1992;Levine, Suriyakham, Rowe, Huttenlocher, & Gunderson, 2010). Nevertheless, by observing the multiple predictive patterns in the surface structure of numbers (Yuan, Xiang, Crandall, & Smith, 2020), preschoolers learn to map spoken multidigit number words to their written forms (Mix, Prather, Smith, & Stockton, 2014;Yuan, Prather, Mix, & Smith, 2019). In sum, children learn from complex, irregular input (i.e., language, symbolic numbers) without supervised instruction, in order to make predictions about their environment (Saffran, 2020).…”