Adding two two-digit numbers

Add and subtract two two-digit numbers using concrete objects, pictorial representations, and mental methods

Usually learned at ages 6–7

Builds on: Mental addition and subtraction (age 6+), Adding and subtracting tens mentally

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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