Adding and subtracting (age 8+)

Add and subtract numbers with up to four digits using formal written methods of columnar addition and subtraction

Usually learned at ages 8–9

Builds on: Place value of each digit, 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