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

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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