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The present study investigated the mediating role of number-related skills in the developmental relationship between early cognitive competencies and later fraction knowledge, using structural equation modeling. Fifth-grade numerical skills mapped onto two distinct factors: magnitude reasoning and calculation, which fully mediated relationships between third-grade general cognitive competencies and sixth-grade fraction knowledge. However, specific developmental pathways differed by type of fraction knowledge. Magnitude reasoning fully mediated paths from all four cognitive competencies to knowledge of fraction concepts, while calculation fully mediated paths from attentive behavior and verbal to knowledge of fraction procedures (medium-to-large effect sizes). These findings suggest that there are partly overlapping, yet distinct developmental pathways from cognitive competencies to general fraction knowledge, fraction concepts, and fraction procedures, respectively.
Ai Ye, University of North Carolina - Chapel Hill
Ilyse Resnick, University of Delaware
Nicole Hansen, Fairleigh Dickinson University
Jessica Carrique, University of Delaware
Luke Rinne, University of Delaware
Nancy C. Jordan, University of Delaware