Mathematics - Primary 5 - Plane shapes

Plane shapes

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Term: 2nd Term

Week 7: Plane Shapes

Class: Primary 5
Age: 10 years
Duration: 40 minutes of 5 periods
Date:
Subject: Mathematics
Topic: Perimeter of Plane Shapes

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

  1. Explain the concept of perimeter.
  2. Calculate the perimeter of regular and irregular shapes.
  3. Solve for the perimeter of a circle.
  4. Relate perimeter to real-life problems and solve.
  5. Solve quantitative aptitude problems related to the perimeter of regular and irregular plane shapes.

INSTRUCTIONAL TECHNIQUES:

  • Demonstration
  • Problem-solving approach
  • Use of real-life examples
  • Group work and interactive discussions

INSTRUCTIONAL MATERIALS:

  • Charts showing different shapes and their perimeter formulas
  • Real-life objects (e.g., boxes, circles, etc.)
  • Whiteboard, markers, and erasers
  • Rulers and measuring tape

INSTRUCTIONAL PROCEDURES:

PERIOD 1 and 2: Introduction to Perimeter

Step

Teacher’s Activity

Pupil’s Activity

STEP 1 - INTRODUCTION

Introduces the concept of perimeter as the total length around a shape.

Pupils listen and ask questions.

STEP 2 - EXPLANATION

Explains how to calculate the perimeter of different shapes (rectangles, squares, and triangles).

  • For a rectangle:
    Perimeter=2×(Length + Breadth)
  • For a square:
    Perimeter=4×Side

Pupils take notes and ask for clarification

STEP 3 – DEMONSTRATION

Demonstrates calculating the perimeter of a rectangle and square with given measurements

Pupils observe and follow along with their own examples.

STEP 4 – PRACTICE

Assigns problems for pupils:

  • Find the perimeter of a rectangle with length 10 cm and breadth 5 cm.
  • Find the perimeter of a square with side 4 cm.

Pupils complete the problems independently.

 

NOTE (On the Board):

  • Formula for Perimeter of a Rectangle:
    Perimeter=2×(Length+Breadth)
  • Formula for Perimeter of a Square:
    Perimeter=4×Side

EVALUATION:

  • Ask pupils to find the perimeter of a rectangle with length 6 cm and breadth 8 cm.

CLASSWORK:

  • Solve for the perimeter of the following shapes:
  1. A rectangle with length 12 cm and breadth 4 cm.
  2. A square with side 7 cm.

ASSIGNMENT:

  • Write down the perimeter formulas for different plane shapes.

CONCLUSION:
The teacher summarizes the perimeter formulas for common shapes.

 

 

PERIOD 3 and 4: Irregular Shapes and Circle

Step

Teacher’s Activity

Pupil’s Activity

STEP 1 - INTRODUCTION

Introduces the concept of irregular shapes and how to calculate their perimeter.

Pupils ask questions for clarification.

STEP 2 - EXPLANATION

Explains that the perimeter of irregular shapes is found by adding the lengths of all sides.

Pupils listen and take notes.

STEP 3 - DEMONSTRATION

Demonstrates calculating the perimeter of an irregular shape (e.g., an irregular polygon).

Pupils observe and follow along.

STEP 4 - PRACTICE

Assigns problems involving irregular shapes for practice.

Pupils work on problems.

NOTE (On the Board):

  • Formula for Perimeter of an Irregular Shape:
    Add the lengths of all sides.

EVALUATION:

  • Ask pupils to find the perimeter of an irregular shape with given side lengths.

CLASSWORK:

  • Solve for the perimeter of irregular shapes with given side lengths.

ASSIGNMENT:

  • Find the perimeter of an irregular polygon in their surroundings.

CONCLUSION:
The teacher reviews the calculation of perimeter for regular and irregular shapes.

 

PERIOD 5: Perimeter of Circle and Real-Life Application

Step

Teacher’s Activity

Pupil’s Activity

STEP 1 - INTRODUCTION

Introduces the concept of the perimeter of a circle, also known as the circumference.

Pupils ask questions and prepare to learn about circles.

STEP 2 - EXPLANATION

Circumference=2πr

Pupils take notes and ask questions

 

where r is the radius of the circle.

  

 

.

  

STEP 3 - DEMONSTRATION

Solves a problem on calculating the circumference of a circle with radius 5 cm.

Pupils follow along and complete the same problem.

STEP 4 - PRACTICE

Assigns problems:

Find the circumference of a circle with radius 7 cm.

Pupils solve independently.

 

NOTE (On the Board):

  • Formula for Circumference of a Circle:
    Circumference=2πr

EVALUATION:

  • Ask pupils to find the circumference of a circle with a given radius.

CLASSWORK:

  • Solve for the circumference of circles with different radii.

ASSIGNMENT:

  • Apply the perimeter of circles to real-life situations, such as measuring the perimeter of a round table.

CONCLUSION:
The teacher summarizes how to calculate the perimeter of regular, irregular shapes, and circles.