10 or 100 More or Less
Find 10 or 100 more or less than a given number up to 1000
Lesson
Set out your lesson
Add or subtract tens and hundreds, including regrouping boundaries.
Before teaching
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Inferred, not a taxonomy edge: learner can access the supplied prompt with agreed support and can explain or mark a response. If earlier skills are unfamiliar, use the prerequisite topic for teaching; an authored prerequisite is not proof this learner is ready.
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1 approach
Add or subtract tens and hundreds, including regrouping boundaries.
Add or subtract tens and hundreds, including regrouping boundaries.
Family records and proof options
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Learning resources
Extra practice links — they do not replace Gakuva’s teaching approach.
Illustrative Mathematics · Practice link — not the full lesson
Choral Counting
Before you open · source notes
A class count records jumps of 10 or 100 with base-ten thinking. Use it for 10 or 100 more or less, not every skip-count song.
Free, no sign-in. A teacher solution is on the same page, so use the student view with your child.
Before you openAsk what number is 10 or 100 more than a starting number on the recorded count.
Opening this link does not save learning or assess mastery.
Source, access and review notes
Public Illustrative Mathematics task page. The .html address responds HTTP 308 to this URL. An anonymous GET of this URL on 2026-11-12 returned HTTP 200 with no login or payment prompt. Where a teacher solution is present, it is on the same page as the student task; this check did not find a separate locked student view. An adult can use the student view section and should not read a solution aloud. Advertising was not observed in the fetched HTML text; that is not a browser, device, or ad-free guarantee. This is a paper or discussion task, not an automatically marked interactive game. Opening the link does not save practice or assess mastery. Diagrams on the page use missing or filename-only alt text, so they are not an accessible image equivalent. Accessibility still depends on an adult describing the picture.
Illustrative Mathematics. “Choral Counting.” Licensed CC BY-NC-SA 4.0. External task; Gakuva does not copy, host, embed, or redistribute it.
CC BY-NC-SA 4.0 — link only
Check understanding
- 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)
“Can your child quickly work out '10 more than 342' or '100 less than 875' in their head — knowing which digit changes and which stays the same?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Number Representation & Place Value
- Age range
- Ages 7–9
Standards