Adding Time Intervals

This is the 1st lesson of the second week teaching time to 5th and 6th class. They get work done extremely quick so must be loads in the lesson. It is important there is teaching in it. I want it to focus on: (LOs) Add time intervals involving hours and minutes accurately • Solve practical elapsed time problems • Explain strategies used when solving time problems

(Content) • Addition of time • Elapsed time calculations • Real-life scenarios involving journeys and schedules • Progression from simple to more complex calculation

(Inclusive methodlogies) • Teacher modelling • Pair work • Oral discussion • Mini whiteboards • Teacher observation • Teacher questioning • Worksheet • Mini whiteboards

Curriculum Links (IE Curriculum)

Strand: Measures
Strand Unit: Time
Strand Unit Indicator: 5th/6th class

Estimate, measure and calculate time intervals accurately using hours and minutes
Solve practical problems involving the addition and subtraction of time
Explain methods and reasoning used in time calculations
Use time in real-life contexts such as timetables, journeys, and schedules

Competencies Developed:

Critical thinking and problem solving
Communication and oral explanation
Collaborative learning
Mathematical reasoning

Learning Objectives

By the end of the 40-minute lesson, pupils will be able to:

Add time intervals involving hours and minutes accurately.
Solve practical elapsed time problems related to journeys and schedules.
Explain and justify strategies used to solve time problems, both orally and in writing.

Resources

Mini whiteboards and markers (1 per pair + teacher)
Printed worksheets with graduated difficulty (simple to complex)
Clocks with movable hands (physical or images)
Large A3 paper and markers for group poster creation
Scenario cards with journey and timetable tasks
Timer or stopwatch for timed challenges

Lesson Structure (40 minutes)

1. Starter Activity: Time Sprint (5 minutes)

Method: Whole class, teacher-led with mini whiteboards.
Display quick-fire time addition problems on board (e.g., 1 hr 25 min + 2 hr 40 min).
Pupils write answers on mini whiteboards and reveal simultaneously.
Teacher models a speedy method for adding hours and minutes, demonstrating regrouping (e.g., 60 minutes = 1 hour).
Quick teacher questioning to probe pupils’ understanding of ‘carrying’ minutes as hours.

2. Teacher Modelling & Explanation (7 minutes)

Use a number line/time line visual on the board and a clock model.
Model step-by-step adding multiple time intervals (e.g., journey: 1 hr 35 min + waiting time: 45 min + next journey: 2 hr 20 min).
Introduce elapsed time calculation with start and finish times.
Verbalise strategies aloud: breaking minutes down, converting totals > 60 into hours, checking work by estimation.

3. Pair Work: Elapsed Time Problem Solving (10 minutes)

Pupils work in pairs with printed worksheets containing real-life journey scenarios (e.g., bus timetables, sports event schedules).
Tasks increase in complexity from adding two intervals to three, some requiring subtraction to find elapsed time.
Pairs use mini whiteboards to solve problems, then discuss and write a short explanation of their strategy on worksheet.
Teacher circulates, observing and questioning to deepen reasoning.

4. Group Drama & Poster Activity (12 minutes)

In groups of 3-4, pupils are given a "Travel Timetable" challenge: create a mini-play or skit depicting a day involving several journey times and waiting periods based on given time intervals.
Groups design posters showing their time calculations, routes, and elapsed times to support their drama.
Emphasis on explaining their addition of time intervals and problem-solving steps in the poster.
Teacher supports with prompts and encourages mathematical vocabulary use.

5. Oral Discussion & Reflection (5 minutes)

Groups present posters briefly and explain the strategies they used.
Teacher leads whole class discussion with questions like:
- How did you handle minutes over 60?
- What helped you check your answers?
- Which problem was the trickiest and why?
Highlight key mathematical language (elapsed time, intervals, conversion, regrouping).

Assessment and Feedback

Formative assessment via teacher observation, questioning during pair and group work.
Use mini whiteboards for instant feedback on calculation accuracy.
Collect worksheets to evaluate explanation written by pupils on strategies used.
End with a quick plenary quiz orally to reinforce correct methods.

Differentiation and Inclusion

Provide simplified worksheets with visual clues for pupils needing extra support.
Challenge advanced pupils with multi-step problems requiring both addition and subtraction of time intervals and conversion between 12- and 24-hour clocks.
Pair stronger with developing pupils to promote peer learning.
Incorporate drama and poster-making to engage kinaesthetic and creative learners.

This detailed and fast-paced lesson ensures plenty of active engagement fitting the teacher’s style and the learners’ needs, embedding clear teaching and consolidated practice, all fully aligned with the IE curriculum’s time strand for older primary pupils.

Teaching Instructions