Numerical estimation has been used to study how children mentally represent numbers for many years (e.g., Siegler & Opfer, 2003). However, these studies have always presented children with positive numbers and positive number lines. Children's mental representation of negative numbers has never been addressed. The present study tested children…

It is one thing to be able to count and share items proficiently, but it is another thing to know how counting and sharing establish and identify quantity. The aim of the study was to identify which measures of numerical knowledge predict children's success on simple number problems, where counting and set equivalence are at issue. Seventy-two…

Reports on experiments where Arabic-speaking subjects were asked to scan arrays of digits in both standard "Western numeral" and "Indian numeral" forms, and compares array-scanning patterns observed with patterns observed with speakers of other languages, particularly English. The implications in terms of the use of…