Math // Measurement

Sequence intervals of time

Compare and sequence intervals of time

Ages
6 to 7
Type
Method
Builds on
2 topics
Leads to
1 topic
Standards
1 code

Quick check

If the learner knows a film takes 2 hours and a car journey takes 45 minutes, can they tell you which takes longer — and put a few daily activities in order of how long they take?

Ask this to see whether the topic is secure.

Topic // Mastery

What mastery looks like

What a learner can do once this topic is secure.
  • Order three events by how long they took
  • Compare the duration of two activities (e.g. 'the race took longer than the walk')
  • Sequence intervals on a timeline

Topic // Map

Where this fits

What to learn first and what this topic opens up, with the reason for each link. Required links come first.
  • RequiredMust come first
  • HelpfulHelps, but not essential

Before this

2 topics
  • Comparing durationsRequired

    Measurement // Ages 4 to 6

    Comparing and sequencing intervals extends Y1 comparative time language

  • Telling time to the minuteRequired

    Measurement // Ages 5 to 6

    Sequencing intervals requires understanding time measurement

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Sequence intervals of time

Ages 6 to 7 // Method

Leads to

1 topic

Topic // Research-informed

Teaching notes

From the Marble Skill Taxonomy. These notes have not been validated in classrooms, so treat them as a starting point for your own judgement.

The approach

Young children (around ages 6–7) compare how long events last, order several events by duration, and sequence intervals on a daily timeline. Because they are not yet expected to calculate elapsed time, comparison should rest on measured or timed evidence (stopwatches, sand-timers, duration bars). A common start is needed specifically when using finishing order as the evidence of who was quicker; when starts differ, children compare the measured running length of each event instead. The central hurdle is judging duration by non-time cues: thinking the faster, further, more exciting, or later-finishing event 'took longer', or reading a later finishing clock time as a longer duration. (A stopwatch or timer started from zero at the start of each event is different: its end reading is the duration, so a bigger reading there does mean longer.) The strongest teaching separates measured duration from speed, distance, and finishing position.

Common misconceptions

  • Judges duration by speed or distance (faster/further = longer) — the time-speed-distance confusion
  • Equates 'finished later / stopped last' with 'took longer', ignoring the start
  • Orders by how exciting or memorable an event was rather than its measured length
  • Treats a bigger clock-number at the end as a longer duration

Useful representations

  • Stopwatch / sand-timers giving a measured duration
  • Duration bars laid side by side for ordering
  • A common start-line for fair comparison
  • A daily timeline for sequencing intervals

Teaching practices

  • Compare timed events with a stopwatch / sand-timers so duration is measured, not guessed
  • Use a common start so 'who finished first' fairly shows quicker (a shorter duration)
  • Explicitly separate 'finished later' from 'took longer' with same-start and different-start cases
  • Order three durations by lining up their measured lengths (bars / timers)
  • Sequence intervals on a timeline of the day

Activities to try

  1. 1

    Timed race from a shared start line, then order the duration bars

    Why it works: How long an event lasts is read from its measured duration, not from how fast, far, or exciting it was. With a common start, whoever stopped first took the shortest time.

    1. Run or watch two or three timed events that all begin at the same common start (for example three sand-timers started together, or three classroom activities timed with a stopwatch).
    2. Watch each event's duration grow as a bar (or sand-timer level) and note the moment it stops.
    3. Arrange the finished bars/timers into order from shortest to longest duration — the order is simply the bar lengths.
    4. Explain how you decided, pointing to the measured length rather than how fast or exciting each looked.
  2. 2

    Different-start challenge: 'finished last' is not 'took longest'

    Why it works: Stopping last only means 'took longest' when everything started together. When starts differ, you must compare how long each event actually ran, not who finished last or whose finishing clock time is later.

    1. Watch a case where one event starts late but stops last, while its measured duration (bar/timer) is actually the shortest.
    2. Decide which event ran for the most time, and justify using the actual running time rather than who stopped last or whose finishing clock time is later.
    3. Compare a same-start case and a different-start case side by side, and say why the start time changes what finishing order tells you.
  3. 3

    Compare and sequence from timer readings

    Why it works: Comparing and ordering durations can be read directly from measured values, and intervals of a day can be sequenced in order.

    1. Look at two timers and decide which event took longer, explaining how the reading shows it.
    2. Sequence three events by how long they took, using their timer readings or measured lengths.
    3. Match each activity to its measured duration.
    4. Place everyday intervals in order on a timeline of the day to sequence intervals of time.

Topic // Standards

Curriculum standards

Codes for the curriculum statements this topic maps to. Each publisher owns its standard text.
The national curriculum in England: Key stages 1 and 2 framework document
Maths/Y2/M/6

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