Lesson Note: Meaning of Area, Areas of Rectangles and Squares (Basic 4)

Class: Primary 4
Term: 3rd Term
Week: 1
Age: 9 years
Period: 2
Duration: 60 minutes (per period)
Date:
Subject: Mathematics
Curriculum Theme: Mensuration and Geometry
Sub-Theme: Secondary Measure
Topic: Area

Content:

• Meaning of Area
• Units of measurement of area
• Area of Rectangles
• Area of Squares
• Word problems involving area
• Quantitative Aptitude on Area

Specific Objectives:

• Cognitive Domain: Pupils should be able to state the meaning of area, use the given formula to find the area of a rectangle, find small areas using unit squares (e.g., cm², m²), solve word problems on areas of rectangles and squares, and solve problems of quantitative aptitude related to area.
• Affective Domain: Pupils should develop a keen interest in solving practical problems involving areas.
• Psychomotor Domain: Pupils should be able to measure lengths accurately using rulers and calculate areas using the formulas.
• Social Domain: Pupils should be able to work in groups to solve area problems, encouraging collaborative learning and problem-solving.

Reference Materials:

• 9 – Years Basic Education Curriculum
• Abuja Educational Resource Centre Scheme of work
• NAPPS National Unified Scheme of Work
• Online Information
• Textbooks: [List your relevant textbook here]

Instructional Materials:

• Rulers
• Whiteboards and markers
• Graph paper
• Sample shapes for area calculation

Rationale for the Lesson:
Understanding the concept of area is essential for real-life applications, such as planning space usage and calculating materials needed for construction or decoration projects. This lesson aims to build foundational skills in measuring areas and applying these skills to solve practical problems.

Prerequisite/Previous Knowledge:
Pupils are expected to have basic knowledge of multiplication and familiarity with measuring lengths.

INSTRUCTIONAL PROCEDURES: LESSON 1

Content Development: Meaning and Units of Area, Area of Rectangles

Classroom Note:

Meaning of Area

Area is defined as the amount of surface covered by a shape or object. It tells us how much space a shape covers and is measured in square units, such as square centimeters (cm²), square meters (m²), and square kilometers (km²).

Units of Measurement of Area

• Square Centimeters (cm²): Used for small surfaces.
• Square Meters (m²): Ideal for larger surfaces, like rooms.
• Square Kilometers (km²): Used for very large areas, like cities.

Calculating Area of Rectangles

The area of a rectangle is found by multiplying its length by its breadth (Area = Length × Breadth).

• Example: For a rectangle with a length of 5cm and a breadth of 4cm, Area = 5cm × 4cm = 20cm².

Evaluation for Lesson 1:

1. Define area.
2. What unit of measurement would you use for a playground?
3. Calculate the area of a rectangle with a length of 8cm and a breadth of 3cm.

INSTRUCTIONAL PROCEDURES: LESSON 2

Content Development: Area of Squares, Quantitative Aptitude on Area

Classroom Note:

Calculating Area of Squares

The area of a square can be found by multiplying the length of one side by itself (Area = Side × Side). Note that a we don’t use Breadth because a the sides of a square are all equal.

• Example: For a square with sides of length 7cm, Area = 7cm × 7cm = 49cm².

Quantitative Aptitude on Area

Quantitative aptitude problems involve applying area concepts to solve more complex and practical problems. This requires understanding and applying the formula in various situations.

• Example: If a square garden has a side length of 10m, find the area. Then, if a path of 1m width runs inside the garden along its boundary, find the area covered by the path.
• Example 2: (Consult pupils workbook/textbook for more exercises and examples.)

Evaluation for Lesson 2:

1. Calculate the area of a square with a side length of 6cm.
2. A square park has a side length of 15m. Calculate its area.
3. Solve a quantitative aptitude problem: A square field has a side of 20m, with a 2m wide road along one of its sides. What is the area of the field excluding the road?

Lesson Vocabulary:

• Area: The amount of space covered by a shape.
• Square Centimeters (cm²): A unit of area measurement for smaller surfaces.
• Square Meters (m²): A unit of area measurement for larger surfaces.

Note to Teachers:
Adapt the lesson plan according to the level of understanding and pace of your pupils. Use real-life examples where possible to make the learning experience more relatable and engaging. Encourage pupils to ask questions and express their thoughts during the lesson.