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MathematicsNumber Representation & Place ValueAges 7–8

10 or 100 More or Less

Find 10 or 100 more or less than a given number up to 1000

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Teaching Table

Set out your lesson

Add or subtract tens and hundreds, including regrouping boundaries.

Activity

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.

Sequence
  • Keep the two adult-only cards off the learner screen. Have a pencil and scrap paper if useful; oral pointing/typing/AAC can replace handwriting unless spelling or composition is the target. No printing, cutting, account or purchase is required.

  • Open Show first, read the explanation together, and pause to check the central idea. Then do Guided Try together.

  • For Try, close earlier models and the adult keys unless the task explicitly supplies a reference. Record any hints, read-aloud help or model reopening; do not call supported work independent.

  • Use only the active learner card. Keep the private key closed until an attempt is recorded. Stop or take a break on request; practical claims stay not observed unless actually done.

No Printer

Use on screen; read aloud or recreate a tactile model only with declared support. No printer or purchased kit.

Privacy

Never display adult keys or dictation spellings with a learner task; no family financial, identity or conflict disclosure.

Never display adult keys or dictation spellings with a learner task; no family financial, identity or conflict disclosure.

Use the complete materials on screen or print only the current sheet. Keep adult guidance out of learner view. Retain an earlier model only when the current step supplies it as context.

Teaching limits and safe use

These are finite task opportunities, not proof of mastery. Record what was attempted and what support was used.

  • Finite mental/calculation sample; no speed or universal fluency claim.

  • These bounded examples do not establish independent performance in other situations. Record the support used.

Never display adult keys or dictation spellings with a learner task; no family financial, identity or conflict disclosure.

Share teaching feedbackContinue to your family plan
Family records and proof options

Keep a record of your learning

Save photos, notes, and attendance. Export a proof packet for compliance or portfolio reviews.

Learning resources

Reviewed external links that reinforce this concept. They do not replace Gakuva’s teaching approach.

No reviewed resources for this concept yet.

The teaching approach above still stands. Curated practice links will appear here as the shelf fills.

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 7–8

Standards

ccss-math:2.NBT.8uk-nc-2013:Ma/KS2/Y3/NPV/1