Mental addition and subtraction (age 6+)

Add and subtract a two-digit number and ones mentally and using concrete/pictorial representations

Usually learned at ages 6–7

Builds on: Adding and subtracting, The two digits of a two-digit number

Nothing here yet in this language. Add the first explanation with your AI.

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