--- title: "10 or 100 More or Less" description: "Find 10 or 100 more or less than a given number up to 1000" canonical: https://lightmysky.com/learn/mathematics/10-or-100-more-or-less-mt_izien3ZX51 source: https://lightmysky.com/learn/mathematics/10-or-100-more-or-less-mt_izien3ZX51.md retrieved: 2026-10-19 --- > **Agent view.** This is the Markdown twin of the page, for tools and assistants. > When to use this site, and the call that answers each job: https://lightmysky.com/agent-instructions.md > API description (OpenAPI 3.1): https://lightmysky.com/openapi.json · Authentication: https://lightmysky.com/auth.md > Pricing: https://lightmysky.com/pricing.md · Catalog: https://lightmysky.com/llms.txt · Full catalog: https://lightmysky.com/llms-full.txt > Every machine-readable file on this domain: https://lightmysky.com/.well-known/ai-catalog.json > Ask for Markdown with `Accept: text/markdown`, a `.md` address, or `?mode=agent`. # 10 or 100 More or Less Find 10 or 100 more or less than a given number up to 1000 Subject: Mathematics · Area: Number Representation & Place Value · Ages 7 to 8 Page: https://lightmysky.com/learn/mathematics/10-or-100-more-or-less-mt_izien3ZX51 ## Ready when they can - Given a three-digit number, state what is 10 more and 10 less - Given a three-digit number, state what is 100 more and 100 less - Explain the strategy using place-value understanding (e.g. only the tens/hundreds digit changes) ## Lesson: 10 or 100 More or Less Three-digit numbers use the same place value idea. A jump of 10 changes the tens digit. A jump of 100 changes the hundreds digit. *(drawing: 342 plus 10 is 352. 342 minus 10 is 332. Only the tens digit moves.)* **Example.** Try 739. Add 100, and only the hundreds digit moves up, from 7 to 8, giving 839. Take away 100, and the hundreds digit moves down to 6, giving 639. The tens digit (3) and ones digit (9) do not change. For a two-step change, try 701. First add 10 to make 711. Then take away 100 from 711 to make 611. The first jump changes the tens digit, and the second changes the hundreds digit. **Tip.** Look at which digit is supposed to move. A jump of 10 moves the tens digit. A jump of 100 moves the hundreds digit. Every other digit stays put. **Recap.** Adding or taking 10 moves the tens digit, and adding or taking 100 moves the hundreds digit, while every other digit stays the same. ## Practice 18 questions on this page, each with its working shown. ## Needs first - [The three digits of a three-digit number](https://lightmysky.com/learn/mathematics/the-three-digits-of-a-three-digit-number-mt_aPBzD28_mT) - [10 More or 10 Less](https://lightmysky.com/learn/mathematics/10-more-or-10-less-mt_kw7xmp68rU) ## Opens up - [Place Value to 1000](https://lightmysky.com/learn/mathematics/place-value-to-1000-mt_98c2qwEF7Q) - [1000 More or Less](https://lightmysky.com/learn/mathematics/1000-more-or-less-mt_9XVFje6Tyr) - [Mentally adding tens to 3-digit numbers](https://lightmysky.com/learn/mathematics/mentally-adding-tens-to-3-digit-numbers-mt_aHQ9kNt3is) - [Mentally adding hundreds to 3-digit numbers](https://lightmysky.com/learn/mathematics/mentally-adding-hundreds-to-3-digit-numbers-mt_xPqczp7zPX)