# Adding within 100

Add within 100 using strategies based on place value, including adding a two-digit and one-digit number, and a two-digit and a multiple of 10

Builds on: Addition and subtraction within 20 (hard, https://ai.page/c/addition-and-subtraction-within-20/en.md), The two digits of a two-digit number (hard, https://ai.page/c/the-two-digits-of-a-two-digit-number/en.md)

Concept id: adding-within-100. Subject: maths. Licence: CC BY-SA 4.0.

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