EXPRESS: Mathematics anxiety and number processing: The link between executive functions, cardinality, and ordinality.

One important factor that hampers children's learning of mathematics is math anxiety (MA). Still, the mechanisms by which MA affects performance remain debated. The current study investigated the relationship between MA, basic number processing abilities (i.e., cardinality and ordinality processing), and executive functions in school children enrolled in grade 4-7 (N = 127). Children were divided into a high math anxiety group (HMA; N = 29) and a low math anxiety group (LMA; N = 31) based on the lowest quartile and the highest quartile. Using a series of ANOVAs, we find that highly math anxious students do not perform worse on cardinality processing tasks (i.e., digit comparison and non-symbolic number sense), but that they perform worse on numerical and non-numerical ordinality processing tasks. We demonstrate that children with high MA show poorer performance on a specific aspect of executive functions - shifting ability. Our models indicate that shifting ability is tied to performance on both the numerical and non-numerical ordinality processing tasks. A central factor seems to be the involvement of executive processes during ordinality judgments, and executive functions may constitute the driving force behind these delays in numerical competence in math anxious children.