Number bonds to 9

Find the number that makes 10 when added to a given number from 1 to 9 (number bonds to 10)

Usually learned at ages 4–6

Builds on: Numbers up to 10 into pairs

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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