# Addition and subtraction within 1000

Add and subtract within 1000 using concrete models, drawings, and strategies based on place value; understand composing and decomposing tens and hundreds

Builds on: The three digits of a three-digit number (hard, https://ai.page/c/the-three-digits-of-a-three-digit-number/en.md), Fluent adding and subtracting within 100 (hard, https://ai.page/c/fluent-adding-and-subtracting-within-100/en.md)

Concept id: addition-and-subtraction-within-1000. Subject: maths. Licence: CC BY-SA 4.0.

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