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Cracking the Code of Place Value: The Relationship between "Place" and "Value" Takes Years to Master
Peer reviewed
Direct linkCheung, Pierina; Ansari, Daniel – Developmental Psychology, 2021
"Place value," which underlies the meanings of multidigits, encompasses the principle of position and base-10 rules. To understand 65, one needs to know that the digits 6 and 5 occupy different positions and thus represent ordered values of different magnitudes (i.e., the "principle of position") and that the value of each…
Descriptors: Number Concepts, Children, Child Development, Age Differences
Van Herwegen, Jo; Ansari, Daniel; Xu, Fei; Karmiloff-Smith, Annette – Developmental Science, 2008
Previous studies have suggested that typically developing 6-month-old infants are able to discriminate between small and large numerosities. However, discrimination between small numerosities in young infants is only possible when variables continuous with number (e.g. area or circumference) are confounded. In contrast, large number discrimination…
Descriptors: Toddlers, Infants, Number Concepts, Numeracy
