Class: Primary 3
Term: 3rd Term
Week: 3
Age: 8 years
Duration: 45 minutes
Subject: Mathematics
Curriculum Theme: Measurement
Previous Lesson: Weight, Conversion of Units of Weight.
Topic: Time
Subject Matter: Identification and reading of clocks to half-hour and quarter-hour, Telling time in minutes, Changing seconds to minutes and minutes to seconds, Word problems on time

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:

Identify and read clocks to half-hour and quarter-hour (e.g., 2:15, 10:30).
Tell time in minutes accurately.
State the conversion factors between seconds and minutes.
Recall steps for solving word problems on time.

Affective Domain:

Appreciate the importance of time in daily life.
Develop patience and attention to detail when solving time-related problems.

Psychomotor Domain:

Draw clock faces to show specific times.
Perform conversions between seconds and minutes.
Solve simple word problems involving time.

Work collaboratively with peers to understand and solve time problems.
Share their understanding of telling time and conversions with classmates.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum
State Unified Scheme of Work
New General Mathematics for Primary 3

Instructional Materials

The teacher will teach this lesson with the aid of:

A large demonstrative wall clock with movable hands
Flashcards showing different times
Charts illustrating clock faces and time conversions
Stopwatch

Rationale for the Lesson

This lesson helps pupils understand how to read and interpret time, which is an important life skill. Understanding time enables pupils to manage their daily activities and solve practical problems related to duration and schedules.

Prerequisite/Previous Knowledge

Pupils should have prior knowledge of counting numbers, basic addition and subtraction, and recognizing numbers on a clock face.

Lesson Content/Board Summary

Time

Identification and Reading of Clocks to Half-hour and Quarter-hour

A clock has two main hands: the shorter hand is the hour hand, and the longer hand is the minute hand. The numbers 1 to 12 represent hours.

The following are ways to read time:

Half-hour: When the minute hand points to the number 6, it means 30 minutes past the hour, also known as “half past.” For example, 10:30 is half past 10.
Quarter-hour:
- When the minute hand points to the number 3, it means 15 minutes past the hour, also known as “quarter past.” For example, 2:15 is quarter past 2.
- When the minute hand points to the number 9, it means 45 minutes past the hour, also known as “quarter to” the next hour. For example, 7:45 is quarter to 8.

Telling Time in Minutes

Each number on the clock face represents 5 minutes when the minute hand points to it. The small marks between numbers represent 1 minute each.

To tell time in minutes, count by 5s for each number the minute hand has passed, starting from 12.

Example: If the hour hand is slightly past 7 and the minute hand is on 4, the time is 7:20 (because 4 x 5 minutes = 20 minutes).

Changing Seconds to Minutes and Minutes to Seconds

Time can be converted between seconds and minutes using the following relationship:

1 minute = 60 seconds

To change minutes to seconds: Multiply the number of minutes by 60.

Example 1: Convert 3 minutes to seconds.
- Step 1: Recall the conversion factor: 1 minute = 60 seconds.
- Step 2: Multiply the minutes by 60: 3 minutes × 60 seconds/minute = 180 seconds.
- Answer: 3 minutes is 180 seconds.
Example 2: Convert 5 minutes 10 seconds to seconds.
- Step 1: Convert 5 minutes to seconds: 5 × 60 = 300 seconds.
- Step 2: Add the remaining seconds: 300 + 10 = 310 seconds.
- Answer: 5 minutes 10 seconds is 310 seconds.

To change seconds to minutes: Divide the number of seconds by 60.

Example 1: Convert 120 seconds to minutes.
- Step 1: Recall the conversion factor: 1 minute = 60 seconds.
- Step 2: Divide the seconds by 60: 120 seconds ÷ 60 seconds/minute = 2 minutes.
- Answer: 120 seconds is 2 minutes.
Example 2: Convert 200 seconds to minutes and seconds.
- Step 1: Divide 200 by 60: 200 ÷ 60 = 3 with a remainder of 20.
- Step 2: The quotient is minutes, and the remainder is seconds.
- Answer: 200 seconds is 3 minutes and 20 seconds.

NOTE: When converting from smaller units (seconds) to larger units (minutes) divide, but when converting from larger units (minutes) to smaller units (seconds) multiply.

Word Problems on Time

Solving word problems on time requires careful reading and applying the correct operations.

Steps to solve word problems:

Read the problem carefully to understand what is being asked.
Identify the given information and what needs to be found.
Choose the correct operation (addition, subtraction, or conversion).
Solve the problem and state the answer with the correct units.

Example 1: A boy started reading at 6:00 PM and finished at 6:45 PM. How long did he read?
- Step 1: Identify starting time (6:00 PM) and finishing time (6:45 PM).
- Step 2: Calculate the difference in time: 6:45 PM – 6:00 PM = 45 minutes.
- Answer: He read for 45 minutes.
Example 2: Mary spent 2 minutes 30 seconds washing her hands. How many seconds did she spend in total?
- Step 1: Convert 2 minutes to seconds: 2 × 60 = 120 seconds.
- Step 2: Add the remaining seconds: 120 + 30 = 150 seconds.
- Answer: Mary spent 150 seconds washing her hands.

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher displays a wall clock and asks pupils to identify the different parts and their functions. The teacher also asks pupils about the importance of telling time.
Pupils’ Activity: Pupils identify the hour hand, minute hand, and numbers on the clock. They share their ideas on why time is important.
Learning Point: Pupils recall prior knowledge of clocks and appreciate the relevance of time.

Step 2: Identification and Reading of Clocks to Half-hour and Quarter-hour

Time: 8 minutes
Teaching Skill: Explanation/Demonstration
Teacher’s Activity: The teacher uses the demonstrative clock to show how to read time to the half-hour (e.g., 3:30) and quarter-hour (e.g., 9:15, 6:45). The teacher explains “half past,” “quarter past,” and “quarter to.”
Pupils’ Activity: Pupils observe the teacher’s demonstration and listen attentively. They attempt to read the times shown by the teacher.
Learning Point: Pupils learn to identify and read times expressed in half-hours and quarter-hours.

Step 3: Practice Reading Half-hour and Quarter-hour

Time: 5 minutes
Teaching Skill: Guided Practice
Teacher’s Activity: The teacher shows various flashcards with times like 1:30, 4:15, 11:45, and asks pupils to read them aloud.
Pupils’ Activity: Pupils take turns reading the times on the flashcards, indicating “half past,” “quarter past,” or “quarter to.”
Learning Point: Pupils gain confidence in reading half-hour and quarter-hour times.

Step 4: Telling Time in Minutes

Time: 7 minutes
Teaching Skill: Explanation/Illustration
Teacher’s Activity: The teacher explains that each number on the clock represents 5 minutes for the minute hand and demonstrates how to count minutes by 5s. The teacher sets the clock to various times (e.g., 7:20, 2:55) and guides pupils to tell the time in minutes.
Pupils’ Activity: Pupils practice counting minutes by 5s and tell the time shown on the demonstrative clock.
Learning Point: Pupils understand how to tell time in specific minutes.

Step 5: Changing Seconds to Minutes and Minutes to Seconds

Time: 7 minutes
Teaching Skill: Conceptual Explanation
Teacher’s Activity: The teacher introduces the relationship “1 minute = 60 seconds” and explains the rules for converting between minutes and seconds (multiply by 60 for minutes to seconds, divide by 60 for seconds to minutes).
Pupils’ Activity: Pupils listen and note down the conversion rule. They ask questions for clarification.
Learning Point: Pupils learn the conversion factor between minutes and seconds and the rules for conversion.

Step 6: Practice Time Conversions

Time: 5 minutes
Teaching Skill: Problem Solving/Application
Teacher’s Activity: The teacher writes simple conversion problems on the board, such as “Convert 4 minutes to seconds” and “Convert 180 seconds to minutes,” and guides pupils through the step-by-step solutions.
Pupils’ Activity: Pupils attempt to solve the conversion problems on their slates or in their notebooks, following the teacher’s guidance.
Learning Point: Pupils apply the conversion rules to change seconds to minutes and minutes to seconds.

Step 7: Word Problems on Time

Time: 5 minutes
Teaching Skill: Problem Solving/Reasoning
Teacher’s Activity: The teacher presents a few simple word problems on time, such as “If John started his homework at 5:00 PM and finished at 5:30 PM, how long did he spend?” The teacher guides pupils to identify the relevant information and solve the problems.
Pupils’ Activity: Pupils read the word problems and participate in discussing how to solve them, performing calculations as guided.
Learning Point: Pupils apply their knowledge of time to solve real-life word problems.

Step 8: Evaluation/Review

Time: 5 minutes
Teaching Skill: Questioning/Assessment
Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

What time is “quarter past 5”?
If the minute hand is on 8 and the hour hand is slightly past 10, what is the time?
How many seconds are in 5 minutes?
Convert 240 seconds to minutes.
A bus left the station at 9:00 AM and arrived at its destination at 9:40 AM. How long did the journey take?

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 9: Conclusion

Time: 3 minutes
Teaching Skill: Summarization
Teacher’s Activity: The teacher summarizes the key points of the lesson, reinforcing the importance of being able to tell time and perform simple time conversions. The teacher gives pupils homework to practice telling time and solving word problems.
Pupils’ Activity: Pupils listen to the summary and copy down the assigned homework.
Learning Point: Pupils consolidate their learning and are prepared for further practice.

Home Task: Solve three new exercises on Time. Show each step and check each answer.

Lesson Keywords

Clock – An instrument used for telling time.
Hour hand – The short hand on a clock that shows the hour.
Minute hand – The long hand on a clock that shows the minutes.
Half-hour – 30 minutes past the hour.
Quarter-hour – 15 minutes past the hour (quarter past) or 45 minutes past the hour (quarter to).
Seconds – A small unit of time; 60 seconds make 1 minute.
Minutes – A unit of time; 60 minutes make 1 hour.

Differentiation

For struggling learners, the teacher will provide extra practice with physical clocks and focus on reading time to the hour and half-hour before moving to quarter-hours and minutes. Visual aids and one-on-one guidance will be used. For advanced learners, the teacher will introduce more complex word problems involving multiple steps or conversions between hours and minutes.

Note for teachers using this lesson plan

Ensure a large, clear demonstrative clock is available and used effectively throughout the lesson. Encourage active participation by allowing pupils to manipulate the clock hands and explain their reasoning. Emphasize the practical applications of telling time in daily routines.