Although it has been proposed that the ability to compare numerical magnitudes is related to mathematics achievement, it is not clear whether this ability "predicts" individual differences in later mathematics achievement. The current study addressed this question in typically developing children by means of a longitudinal design that examined the…

Compared reading and mathematics competencies of children with poor arithmetic fact mastery at the end of third grade to those of grade-level peers with good arithmetic fact mastery. Found that children with poor fact mastery showed little growth on timed number facts across second and third grades, despite normal growth in other mathematics…