# Adding and subtracting (age 8+)

Add and subtract numbers with up to four digits using formal written methods of columnar addition and subtraction

Builds on: Place value of each digit (hard, https://ai.page/c/place-value-of-each-digit/en.md), Adding and subtracting (age 7+) (hard, https://ai.page/c/adding-and-subtracting-age-7/en.md)

Concept id: adding-and-subtracting-age-8. Subject: maths. Licence: CC BY-SA 4.0.

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