Measuring Time Precisely

Overview

Students explore how to read and calculate time in minutes using analogue and digital clocks. They apply their understanding to the hockey context in Maths No Problem! 4B, Lesson 14, connecting elapsed time with a timeline and familiar daily events.

Learning intentions

• WALT measure and describe time in minutes.
• We are learning to read analogue and digital times.
• We are learning to use a timeline to calculate how long an activity lasts.
• We are learning to explain our mathematical thinking using precise time vocabulary.

Success criteria

• I can read and record a time on an analogue and digital clock.
• I can use 24-hour time when appropriate.
• I can calculate the number of minutes between two times.
• I can explain how I know my answer.

Curriculum links

• Mathematics and Statistics — measuring duration using appropriate time-based units.
• Mathematics and Statistics — estimating and measuring familiar durations.
• Mathsteasers — higher-order thinking and challenge through reasoning.
• Mathsteasers / Alignment — applying mathematical ideas in a relevant, connected context.

Lesson structure (30 minutes)

1. 0–4 min · Hook and estimate. Open with the opening time challenge and show a picture of children playing hockey with the question, “How long might a hockey game last?” Students make a sensible estimate, discuss it with a partner, and share the time unit they would use.

2. 4–9 min · Read and connect times. Use the analogue and digital clock examples to review hours, minutes, digital time, analogue time and 24 hours. Teacher models reading the minute hand by counting in fives, then links a time such as 3:20 to a digital display. Students read several displayed times aloud and identify whether each is morning or afternoon.

3. 9–14 min · Model a timeline. Teacher introduces the words timeline and calculate, then models an elapsed-time problem: hockey starts at 3:15 pm and stops at 3:40 pm. Draw a timeline, count forward in minutes, and record 25 minutes. Students help complete a second example, explaining why counting from the start time is useful.

4. 14–23 min · Guided textbook exploration. Direct students to Maths No Problem! 4B, pages 101–103, focusing on “At what time did the girls stop playing hockey?” Students work in pairs to read the clocks, identify the start and end times, and use a timeline or jumps of five minutes to calculate the duration. Circulate and question: “What does the minute hand show?”, “What is the first time you know?”, and “How can you check your answer?” Use the hockey investigation prompts to keep the discussion focused.

5. 23–27 min · Independent practice and explanation. Distribute the time calculation practice sheet. Students complete selected questions independently, recording both the answer and a short explanation or timeline. Early finishers create a new duration question involving a familiar activity, such as reading, swimming or travelling to school.

6. 27–30 min · Share and exit check. Invite two students to explain different strategies for finding elapsed time, then display the final reflection slide. Students complete the final question on the worksheet: “An activity begins at 10:35 am and ends at 10:55 am. How many minutes does it last? Show how you know.” Collect responses to identify students needing further support.

Resources

• Maths No Problem! Textbook 4B, pages 101–103
• Maths No Problem! Workbook, pages 69–70
• the time and elapsed-time slide deck
• the time calculation practice sheet
• Demonstration analogue clock with movable hands
• Individual mini analogue clocks, if available
• Whiteboard and markers
• Pencils and erasers

Assessment

• Listen for accurate use of hours, minutes, digital, analogue, 24 hours, timeline and calculate during partner talk.
• Check whether students read the minute hand correctly and use a suitable strategy for finding elapsed time in the textbook and workbook tasks.
• Use the final worksheet question as an exit check. Sort responses into: secure, developing, or requiring a small-group reteach using a clock and timeline.

Differentiation

• Support students by providing a movable clock, a five-minute counting strip and a partially completed timeline. Encourage them to count in five-minute jumps before counting on by single minutes.
• Pair students strategically and provide sentence starters: “The activity started at…”, “It stopped at…”, and “I know because…”.
• For students who find analogue clocks difficult, begin with quarter-hour and five-minute times, then move to exact minutes. Read times aloud and display them digitally as well.
• Extend confident students by asking them to solve a crossing-hour problem, such as 3:45 pm to 4:10 pm, and to represent the same time using analogue, digital and 24-hour notation.
• Support EAL learners with the visual clock models, gestures and repeated oral rehearsal of key vocabulary. Allow students to explain their reasoning using drawings, numbers or speech.