Ratio (age 10+)

Perform mental calculations including with mixed operations and large numbers, using strategies such as partitioning, compensation, and derived facts

Usually learned at ages 10–11

Builds on: Mental addition and subtraction (age 9+), Long multiplication (age 10+) (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