# Fluent addition and subtraction

Recall and use addition and subtraction facts to 20 fluently, and derive and use related facts up to 100

Builds on: Addition and subtraction within 20 (hard, https://ai.page/c/addition-and-subtraction-within-20/en.md), The two digits of a two-digit number (soft, https://ai.page/c/the-two-digits-of-a-two-digit-number/en.md)

Concept id: fluent-addition-and-subtraction. Subject: maths. Licence: CC BY-SA 4.0.

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