Math lesson plan · 4th grade (Year 5 in England) · 45 minutes
12-hour and 24-hour clock
Measurement
England: Y4 MeasurementEngland: Y5 Measurement
Objective and success criteria
Students will: 12-hour and 24-hour clock.
- I can answer questions on today's skill on my own, without help.
- I can explain each step and say why it works.
- I can check my answer and spot a mistake.
Before and after
Needs first: Tell time to five minutes
Leads to: Timetables and time problems; 24-hour times and durations, including overnight; Read bus and train timetables
Materials: Rulers, scales and measuring jugs, Clock faces, Conversion chart, Mini whiteboards and pens, Printed student sheet (below).
Warm-up · 5 min
- Quick retrieval from earlier learning (Tell time to five minutes). Students answer on mini whiteboards.
- Show answers together and note who needs support in the main task.
Hook · 5 min
- Ask the class to estimate the length of the room or the weight of a bag before measuring it.
- Share the objective: 12-hour and 24-hour clock. Read the success criteria together.
I do: model it · 10 min
- Work through the example out loud, saying why you do each step, not just what you do.
- Example: Write 3:30 p.m. using the 24-hour clock. Type it like 14:05.
- Step 1: 3 + 12 = 15
- Step 2: 15:30
- Answer: 15:30
- Pause after each step and ask a student to say what comes next.
We do: guided practice · 10 min
- Do these together. Students try each step on whiteboards before you reveal it.
- Use the hints as prompts rather than giving the answer.
- Write 8:25 p.m. using the 24-hour clock. Type it like 14:05. → 20:25Prompt: For p.m. times, add 12 to the hour.
- A train leaves at 16:05. What is this on a 12-hour clock? Type it like 2:05 (it is p.m.). → 4:05Prompt: Subtract 12 from the hour.
You do: independent practice · 10 min
- Students work on the student sheet. Circulate and check the first two answers of every student early.
- Students who finish: write a question of their own for a partner, with the answer.
The 8 questions are on the student sheet below, with answers in the key.
Exit ticket · 5 min
- Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.
- A train leaves at 18:45. What is this on a 12-hour clock? Type it like 2:05 (it is p.m.). → 6:45Prompt: Subtract 12 from the hour.
- Write 9:40 a.m. using the 24-hour clock. Type it like 14:05. → 09:40Prompt: Morning times keep the same hour; write it with two digits.
Watch out for
- Measuring from the end of the ruler instead of zero.
- Converting units the wrong way (multiplying instead of dividing).
Support and stretch
Support
- Review first: Tell time to five minutes.
- Use concrete materials: rulers, scales and measuring jugs.
- Give the first step of each question, or a partly worked example to finish.
- Pair with a confident partner for the guided practice.
Stretch
- Move on to: Timetables and time problems; 24-hour times and durations, including overnight; Read bus and train timetables.
- Explain a common mistake in writing and how to fix it.
- Write a word problem that uses today's skill, then solve a partner's.
Homework and more practice
Free online practice with hints and printable worksheets for this skill: eurekami.com/math/grade-4.
Free lesson plan from eurekami.com/lesson-plan-builder