Mental addition and subtraction (age 7+)

Mentally add and subtract a three-digit number and ones

Usually learned at ages 7–8

Builds on: The three digits of a three-digit number, Fluent adding and subtracting within 100 (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