Adding numbers

Add up to four two-digit numbers using strategies based on place value and properties of operations

Usually learned at ages 7–8

Builds on: Fluent adding and subtracting within 100, Adding Three Small Numbers

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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