This study investigated the accuracy of three fraction measures (i.e., fraction number line estimation accuracy, general fraction concepts, and fraction arithmetic) for screening fourth graders who might be at risk for mathematics difficulties. Receiver operating characteristic (ROC) curve analyses assessed diagnostic accuracy of the fraction…

Developmental predictors of children's fraction concepts and procedures at the end of fourth grade were investigated in a 2-year longitudinal study. Participants were 357 children who started the study in third grade. Attentive behavior, language, nonverbal reasoning, number line estimation, calculation fluency, and reading fluency each…

The study of the public-school system of Wilmington, Delaware, of which this bulletin is a part, was made by the United States Commissioner of Education upon invitation of a committee of 30 citizens of Wilmington appointed by the board of education, by the city council, and by the mayor of the city, and empowered to arrange for such a study. In…