The emergence of “groupitizing” in children’s numerical cognition
Review articleOpen access
Abstract:

Highlights•Grouping items into subsets in the subitizing range can speed children’s enumeration.•Grouping effects are absent in kindergarten, yet strengthen across grades 1–3.•Set size effects for grouped arrays are clear in K and first, but absent in second and third grades.•Set size slope for enumerating grouped arrays uniquely predicts math fluency.•The emergence of “groupitizing” represents a unique contribution to enumeration and mathematics.

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