Perimeter Mathematics Primary 3 Third Term Lesson Note for Week Three

Table of Contents

Toggle

Third Term Lesson Note for Week Three

Class : Primary 3

Subject : Mathematics

Topic : Perimeter

Duration : 80 minutes

Period : Double Periods

Reference Book :

• New Method Mathematics for Primary Schools, by Oredugba etal.
• Lagos State Unified Schemes of Work for Primary Schools, (Primary 1 – 3).
• Online Resources

Instructional Material : Charts showing regular and irregular shapes, meaning of perimeter

Learning Objectives : By the end of the lesson learners will be able to :

i. Define perimeter

ii. Identify some basic plane shape funding their perimeter of regular and irregular objects.

iii. Calculate the perimeter of some shapes.

Content :

Perimeter is the total length of the sides of a given shape. It is the addition of all the sides of any given shape or object.

For examples :

1. The length of the three sides of a triangles are 7cm, 8cm and 5cm respectively. Find the perimeter of the triangle.

Solution:

Perimeter = 7cm + 8cm + 5cm = 20cm

2. What is the perimeter of a rectangle with length 9cm and breadth 7cm?

Solution :

A rectangle is a shape with four sides. The opposite sides are equal.

Therefore , perimeter = L + B + L + B

= 9cm + 7cm + 9cm + 7cm

= 32cm

Irregular shapes and objects

Perimeter of an irregular shapes can be found using string and a ruler.

Find the perimeter of the shapes below:

 

 

Presentation Steps :

Step 1: Revision of the previous lesson with the learners by asking questions.

Step 2: Introduces the new topic to the learners by asking ” what is perimeter?”

Step 3: He / she calls the learners to explain one after the other. The teacher then explains further with illustrations.

Step 4: The teacher then explains how to find perimeter of regular and irregular shapes using direct methods and formula for regular shapes.

 

Evaluation :

1. Find the perimeter of the shapes given below:

Conclusion : At the end of the lesson, learners were able to answer the questions while the teacher moves around to guide them and makes correction.

Assignment :

1. Calculate the perimeter of the shapes drawn below:

 

2. Find the perimeter of the figure given below using a thread and a ruler.