“…This is also when the early literacy and numeracy skills create a foundation for future reading and mathematical skill development: Symbolic and nonsymbolic numeracy skills, assessed before school entry, have been shown to predict later mathematical skills (Watts et al, 2014;Zhang et al, 2014;Koponen et al, 2016;Koponen et al, 2019;Schneider et al, 2017;Chu et al, 2018;Geary et al, 2018), and early language and literacy skills have been shown to predict reading skills (e.g., Torppa et al, 2010;Ziegler et al, 2010;Psyridou et al, 2018;Hjetland et al, 2020). Reading and mathematical development are deeply interconnected processes, and emerging evidence reveals both shared and unshared predictors of reading and mathematical skill development (e.g., Purpura et al, 2011;Davidse et al, 2014;Purpura and Ganley, 2014;Purpura et al, 2017a;Korpipää, 2020;Vanbinst et al, 2020). At school age, the comorbidity of reading difficulties (RD) and mathematical difficulties (MD) is also common: The rate of the cooccurrence of these difficulties has been estimated to be approximately 30-70% (Landerl and Moll, 2010;Moll et al, 2019).…”