# Unknown in Addition & Subtraction

Determine the unknown whole number in an addition or subtraction equation relating three whole numbers

Builds on: Inverse: addition undoes subtraction (soft, https://ai.page/c/inverse-addition-undoes-subtraction/en.md), What the equals sign means (hard, https://ai.page/c/what-the-equals-sign-means/en.md)

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

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