Mental and written addition and subtraction

Solve addition and subtraction problems using mental and written methods, including problems involving numbers, quantities, and measures

Usually learned at ages 6–7

Builds on: Adding two two-digit numbers, Early Word Problems (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