The present study tests two predictions stemming from the hypothesis that a source of difficulty with rational numbers is interference from whole number magnitude knowledge. First, inhibitory control should be an independent predictor of fraction understanding, even after controlling for working memory. Second, if the source of interference is…

This article examines four preadolescent girls' physical lives over three years inside and outside of schools (fourth, fifth, and sixth grades). The girls participated in a school-based physical education intervention during the first two years that was designed to enhance their physical activity (PA) choices in both environments. At the…