Odd or Even

Determine whether a group of objects (up to 20) has an odd or even number of members

Usually learned at ages 7–8

Builds on: Counting in 2s, Addition as combining or putting together two (helps)

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On the map from: Marble Skill Taxonomy (v1), © Generative Spark, Inc. (withmarble.com), text CC BY-SA 4.0, database ODbL 1.0: https://github.com/withmarbleapp/os-taxonomy