Math // Measurement

Number of minutes in an hour

Know the number of minutes in an hour and the number of hours in a day

Ages
6 to 7
Type
Concept
Builds on
1 topic
Leads to
1 topic
Standards
1 code

Quick check

If the learner knows there are 60 minutes in an hour, can they tell you how many minutes are in 2 hours — and how many hours make a whole day?

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.
  • State that there are 60 minutes in an hour
  • State that there are 24 hours in a day
  • Use these facts to solve simple time problems

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

1 topic
  • Telling time to the minuteRequired

    Measurement // Ages 5 to 6

    Knowing 60 min = 1 hour and 24 hours = 1 day extends from measuring time in hours/minutes/seconds

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Number of minutes in an hour

Ages 6 to 7 // Concept

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

Year 2 learners (ages 6-7) learn the key time-unit facts — 60 minutes in an hour, 24 hours in a day — and apply them in simple duration problems. Recall of the facts is usually secure; the real conceptual work is grasping the non-decimal 60-grouping (time is not base-10) and that a whole day is two 12-hour sweeps of the clock (24, not 12). The core approach is to count minutes in fives so a full 60 closes into one hour, and to track the hour hand's double sweep across day and night.

Common misconceptions

  • Thinks a day is 12 hours because the clock face 'stops at 12'
  • Over-applies base-10 — treats 1 hour as 100 minutes, 90 minutes as 9 hours, or half an hour as 50 minutes
  • Fails to regroup at 60 when adding times (3:40 + 30 minutes = 3:70)
  • Muddles which unit is larger (minute vs hour)

Useful representations

  • Analogue clock face
  • A number line marked in minutes and hours
  • A day-strip showing two 12-hour halves (day and night)
  • A 24-hour clock shown alongside the 12-hour clock

Teaching practices

  • Count minutes in fives around the clock so 60 minutes visibly closes into one hour (the 60-grouping)
  • Track the hour hand round the clock twice — morning then night — to build 12 + 12 = 24, linking to am/pm and the 24-hour clock
  • Contrast time with money/base-10 explicitly: 60 minutes make an hour, not 100
  • Use simple duration problems (a 90-minute film) so children APPLY the facts, not just recite them

Activities to try

  1. 1

    The hour hand's double lap: why a day is 24 hours

    Why it works: A whole day is 24 hours because the hour hand goes round the 12-number clock face twice — once from midday to midnight and once from midnight to midday — so 12 + 12 = 24, not 12. One lap alone is 12 hours; it takes two laps to make a day.

    1. Move the hour hand slowly round an analogue clock from midday, naming the hours aloud as it passes the numbers.
    2. When the hand returns to 12, pause and count: that first lap covered 12 hours (midday through to midnight).
    3. Send the hand round a second time, now naming the night and morning hours, and track a day-strip that fills behind the clock — one half for the first lap, the second half for the second lap.
    4. Write down the total: 12 + 12 = 24 hours in a whole day and night.
    5. Line a 12-hour clock up beside a 24-hour clock so that, for example, 1pm matches 13:00, confirming the numbers 1-12 get used twice.
  2. 2

    Closing the hour at 60: the non-decimal grouping

    Why it works: Minutes regroup into hours at 60, not at 100: a full 60 minutes makes one hour, so 90 minutes is 1 hour 30 minutes — the grouping is felt by counting and overflowing, not just recited.

    1. Count minutes in fives around a clock face or along a number line marked in minutes, saying 5, 10, 15 … up to 60.
    2. Notice that it takes exactly 60 minutes for the minute hand to complete one full lap (twelve jumps of 5), so 60 minutes close into 1 hour.
    3. Contrast this with money/base-10 out loud: an hour is 60 minutes, NOT 100 — time does not group in tens and hundreds.
    4. Fill an 'hour container' that only closes at 60: pour in 90 minutes and watch it overflow into one full hour (60) with 30 left over.
    5. Record the result: 90 minutes = 1 hour 30 minutes, because 90 = 60 + 30.
  3. 3

    Apply the facts: simple duration problems

    Why it works: The time-unit facts are tools to be used: a learner who understands them can convert 90 minutes to 1 hour 30 and explain 24 hours as two 12-hour sweeps, transferring the reasoning to fresh problems.

    1. Solve a duration problem such as: 'A cartoon lasts 90 minutes. How many hours and minutes is that, and how do you know?' and state the answer as 1 hour 30 minutes.
    2. Answer a day question with reasoning: 'How many hours are in one whole day and night, and why — when the clock only shows 1 to 12?'
    3. Decide which unit is larger, a minute or an hour, and justify it.
    4. Explain each answer in words, not just give the number, so the reasoning is visible.

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/8

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