Calculating elapsed duration
Calculate the duration between a known start time and a known finish time, including across an hour boundary; distinguish the interval length from either clock reading.
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Calculating elapsed duration means practising the idea at the table with counters or paper models and one clear check. We will demo once, then your child tries.
Materials: Ruler, cup, or clock as fits the topic; Paper for recording. Adult measures one example and records the unit. Child makes three measurements or time/money readings and records each with units. Done: three recordings with correct units. Stop after the fresh check; keep optional challenge for another day.
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Start practiceCalculating elapsed duration practice
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BBC Bitesize · Practice link — not the full lesson
KS2 Maths
Before you open · source notes
KS2 Maths supports Calculating elapsed duration. An adult previews and guides; this is a learning page, not a scored quiz.
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Before you openAsk the learner one fact they learned and one question they still have.
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Source, access and review notes
Public BBC Bitesize page. An anonymous GET on 2026-11-12 returned HTTP 200 with no login or payment prompt for this URL. Opening the link does not save practice or assess mastery. An adult should preview and guide the learner.
BBC Bitesize. “KS2 Maths.” External page; Gakuva does not copy, host, embed, or redistribute materials.
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Check understanding
- Work out that a TV show from 5:17 p.m. to 5:43 p.m. lasted 26 minutes
- Find that an activity from 2:50 p.m. to 4:10 p.m. lasts 1 hour 20 minutes, explaining the regrouping at 60 minutes
- Solve a lesson from 10:15 to 11:00 as a duration of 45 minutes, using a number line or another valid method
“If your child starts cooking at 4:15 p.m. and finishes at 5:00 p.m., can they work out how long it took and explain how they know?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Measurement
- Age range
- Ages 7–9
Standards