Categorization Training Improves Re presentations of Numerical Magnitude

References 40 kindergartners middle-to-high income public school Two Conditions – feedback & no-feedback; otherwise identical Preand Posttests (1) numerical categorization (“is N a very small, small, medium, big, or very big number”) (2) number line estimation (“on this line with 0 and 100 at the ends, where does N go) (3) magnitude comparison (“which number is larger, N or M”) Training Tasks – promote division of numbers between 0-100 into 5 equal-sized categories (1) sorting task – category midpoints (2) sorting task – variable numbers (3) triad task a standard (the category midpoint), an incorrect choice, and a correct choice Number line Estimation Posttest Numerical Magnitude Comparison Accuracy Pretest Numerical Magnitude Comparison Accuracy Pretest Categorization Linearity (R2) Pretest Number Line Estimation Linearity (R2)