Mathematics Topic : (Units of Time) 24 Hour Clock - Strand: Measurement

 FOCUS QUESTION

How do I use the various measurements around me?

SPECIFIC OBJ.

Use the 24-Hour clock in problem solving.

CONTENT SUMMARY

There are 24 hrs. in one day. The 24-hr is divided into two parts of 12 hrs. each. In the 24-hr clock system, time is written as the number of hours that have passed since midnight. In this system, the day is divided into 2 parts of 12 hours each. In this system time is written in 4 digits. The first 2 digits on the left are for the hours and the next two for the minutes.

In the 24-hr system, time starts at 12 hrs. midnight, that is, 00:00 hrs. The next hour after is 01:00. If the first 2 digits to the left are less than 12, the time shows the morning hours or a.m.. If it's more than 12, then it shows afternoon or p.m.

ENGAGE

Students will watch youtube video (Telling Time for Children) , to review the 12 hr clock and its use in telling the time. They will discuss other ways of writing time example quarter to ten would be 9:45.

Engage in discussion on what they know about the 24 hour clock.

EXPLORE

Watch Youtube video (Reading Time In Different Clock System) to glean information on the 24-hr clock. They will identify situations when this feature is used in society. ( Navy/Military, hospital, airports, by scientists)

Students will play a fishing game where they take up a “fish” without looking. They will walk around and search for their “partner fish” which is telling the same time as the "fish" they have.

EXPLAIN

Explain what the 24 hour clock is and compare it with the 12-hr clock. Use the 24 hr clock to show when the different activities below are done.

EXTEND/ELABORATE

Complete the chart below.

Develop rules for converting p.m time to 24-hr clock.

EVALUATE

FOLLOW UP PRACTICE EXERCISES

ACTIVITY 1

ACTIVITY 2

ACTIVITY 3

ACTIVITY 4

ACTIVITY 5

ACTIVITY 6

ACTIVITY 7 

ACTIVITY 8 

ACTIVITY 9

ACTIVITY 10

ACTIVITY 11

Lesson Title: Understanding the 24-Hour Clock

Strand: Measurement
Topic: Units of Time – 24-Hour Clock
Grade: 6
Duration: 1 hour
Focus Question: "How do I use the various measurements around me?"
Objective:

• Students will use the 24-hour clock in problem-solving.

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Materials/Resources:

• Digital/analog clock visuals

• Time conversion cards

• Time zone map or digital tool

• Chart paper or tablets for scheduling

• STEM career images (pilots, coders, nurses)

• Chromebooks, teacher's blogsite

• Projector

🔍 5E Lesson Plan

1. Engage (10 minutes)

Activity: “Time Around the World” Scenario

• Begin with a short video or image slideshow showing different world clocks (e.g., New York 08:00, London 13:00, Tokyo 22:00).

• Ask:

  • “Why do these clocks look different?”

  • “Have you ever seen a clock that says 17:00? What time is that?”

• Let students share experiences of flight times, TV schedules, or sports games using 24-hour format.

STEM Tie-In: Discuss how pilots, engineers, and hospital staff rely on the 24-hour clock to avoid confusion and ensure accuracy.

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2. Explore (15 minutes)

Activity: Matching Time Cards

• Provide sets of 12-hour time cards and matching 24-hour equivalents (e.g., 2:00 PM ↔ 14:00).

• In pairs, students match 12-hour times with their 24-hour equivalents.

• Include real-life examples:

  • “Dinner at 7:00 PM,”

  • “Flight at 23:00.”

• Students discuss: What is different? What is the pattern?

Differentiation:

• 🔹Tier 1 (Support): Use clocks with AM/PM color-coded.

• 🔸Tier 2 (On-level): Use 24-hour conversion table as reference.

• 🔺Tier 3 (Advanced): Include word problems (e.g., calculate arrival time after a 3-hour flight departing at 19:30).

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3. Explain (10 minutes)

Mini-Lesson: How the 24-Hour Clock Works

• Use the board or digital slide to:

  • Show conversion: 1:00 PM → 13:00 (add 12 to PM times).

  • Morning stays the same: 7:00 AM = 07:00.

• Highlight key times:

  • Noon = 12:00

  • Midnight = 00:00

• Practice a few sample conversions as a class.

STEM Focus: Emphasize precision in professions like coding, transport, and surgery—where time tracking must be error-free.

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4. Elaborate (15 minutes)

Activity: 24-Hour Clock Scheduling (STEM + Real Life Task)

• Students create a daily schedule using the 24-hour clock.

• Example:

  • Wake up at 06:30

  • School starts at 08:00

  • Lunch at 12:30

  • Bedtime at 21:00

• Include a challenge: “Create a schedule for an astronaut on a space station or an airline pilot.”

• Complete liveworksheet exercises on teacher's blogsite.

Differentiation:

• 🔹Tier 1: Provide a template and picture support.

• 🔸Tier 2: Use actual school schedule to convert.

• 🔺Tier 3: Include elapsed time between events using 24-hour format.

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5. Evaluate (10 minutes)

Three-Tier Assessment Tasks

Tier	Task
🔹 Tier 1 (Support):	Match 12-hour and 24-hour times using picture clues (e.g., dinner at 18:00).
🔸 Tier 2 (On-Level):	Convert 12-hour times to 24-hour and vice versa (5 examples). Solve 1 time-based word problem.
🔺 Tier 3 (Advanced):	Complete a mini itinerary involving time zone conversion or time calculation (e.g., bus trip leaves at 17:00 and arrives after 4 hours). What time does it arrive in 24-hour format?

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Cross-Curricular Links:

• Science: Time zones, circadian rhythms

• Technology: Digital devices and global syncing

• Engineering: Time scheduling in building and transport

• Math: Time measurement, problem solving

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Reflection / Exit Ticket:

• “One thing I learned today about the 24-hour clock is…”

• “One job where using the 24-hour clock is important is…”