Fluent adding and subtracting within 1000

Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and the relationship between addition and subtraction

Usually learned at ages 8–9

Builds on: Addition and subtraction within 1000, Adding and subtracting (age 7+)

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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