# Adding numbers

Add up to four two-digit numbers using strategies based on place value and properties of operations

Builds on: Fluent adding and subtracting within 100 (hard, https://ai.page/c/fluent-adding-and-subtracting-within-100/en.md), Adding Three Small Numbers (hard, https://ai.page/c/adding-three-small-numbers/en.md)

Concept id: adding-numbers. Subject: maths. Licence: CC BY-SA 4.0.

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