| Summary: | Participants consisted of 496 children (mean age = 6 years; 9 months) recruited from 11 schools in Brisbane, Australia. Children were assessed on the addition and subtraction subtests of the Test of Basic Arithmetic and Number Skills (TOBANS), an adapted version of the Head-Toes-Knees-Shoulders task to measure inhibition, numerosity discrimination using eight subtests varying ratio (2:3 or 5:6) and congruency, and non-verbal cognitive ability using an adapted version of Raven's Coloured Progressive Matrices. Information on children's demographics (gender, English as an additional language, and learning difficulty status) is also provided. All assessments were administered during the second year of formal schooling (i.e. Grade 1). Findings regarding the impact of inhibition on the relation between numerosity discrimination and arithmetic are reported elsewhere [1]. Keywords: Approximate number system (ANS), Arithmetic development, Numerosity judgment, Inhibition, Childhood, Magnitude comparison
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