Addition as combining or putting together two

Understand addition as combining or putting together two groups to find the total

Usually learned at ages 4–6

Builds on: How Many in Total?

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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