# Adding two two-digit numbers

Add and subtract two two-digit numbers using concrete objects, pictorial representations, and mental methods

Builds on: Mental addition and subtraction (age 6+) (hard, https://ai.page/c/mental-addition-and-subtraction-age-6/en.md), Adding and subtracting tens mentally (hard, https://ai.page/c/adding-and-subtracting-tens-mentally/en.md)

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

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