Facts, Math Facts.

A synthesis of four studies regarding math facts:Math Fluency Is Etiologically Distinct From Untimed MathPerformance, Decoding Fluency, and Untimed ReadingPerformance: Evidence From a Twin Study;The Co-Development of Skill at and Preference for Use ofRetrieval-Based Processes for Solving Addition Problems:Individual and Sex Differences from First to Sixth Grade;Cognitive Predictors of Achievement Growth in Mathematics: A Five Year Longitudinal Study;Competence with Fractions Predicts Gains in MathematicsAchievement