# Grouping numbers to add

Understand and apply the associative property of addition: when adding three numbers, any two can be added first

Builds on: Addition as combining or putting together two (hard, https://ai.page/c/addition-as-combining-or-putting-together-two/en.md), Addition in any order (hard, https://ai.page/c/addition-in-any-order/en.md)

Concept id: grouping-numbers-to-add. Subject: maths. Licence: CC BY-SA 4.0.

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