Background: Arithmetical skills are essential to the effective exercise of citizenship in a
numerate society. How these skills are acquired, or fail to be acquired, is of great importance …

Despite the fact that number deficits are as prevalent as literacy deficits, research on basic
numerical skills lags seriously behind the successful studies identifying low-level deficits in …

Comprehensive models of learning disorders have to consider both isolated learning
disorders that affect one learning domain only, as well as comorbidity between learning …

Between 5% and 8% of school-age children have some form of memory or cognitive deficit
that interferes with their ability to learn concepts or procedures in one or more mathematical …

This study investigated the developmental dynamics of mathematical performance during
children's transition from preschool to Grade 2 and the cognitive antecedents of this …

High comorbidity rates between reading disorder (RD) and mathematics disorder (MD)
indicate that, although the cognitive core deficits underlying these disorders are distinct …

Thirty-one 8-and 9-year-old children selected for dyscalculia, reading difficulties or both,
were compared to controls on a range of basic number processing tasks. Children with …

This longitudinal study explored the importance of kindergarten measures of phonological
awareness, working memory, and quantity–number competencies (QNC) for predicting …

This article reports results of a four-year longitudinal study that investigated the impact of
specific and non-specific precursors on mathematical school achievement. Preschool …

Groups of first-grade (mean age= 82 months), third-grade (mean age= 107 months), and fifth-
grade (mean age= 131 months) children with a learning disability in mathematics (MD, n …