Class: Primary 4
Term: 3rd Term
Week: 1
Age: 9 years
Duration: 45 minutes
Subject: General Mathematics
Curriculum Theme: Geometry
Previous Lesson: Meaning of Area, Areas of Rectangles and Squares.
Topic: AREA
Subject Matter: Meaning of area as surface covered, units of area such as cm2 m2 km2, area of rectangles using A = L x B, area of squares using A = length x length, finding small areas using unit squares, word problems involving area, quantitative aptitude on area.

Specific Objectives

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

Cognitive Domain:

State the meaning of area.
Identify the standard units for measuring area (cm², m², km²).
Calculate the area of rectangles using the formula A = L x B.
Calculate the area of squares using the formula A = length x length.
Solve word problems involving the area of rectangles and squares.
Solve quantitative aptitude problems related to area.

Affective Domain:

Appreciate the importance of area in everyday situations.
Participate actively in class discussions and problem-solving activities.

Psychomotor Domain:

Draw simple rectangles and squares with given dimensions.
Use appropriate formulas to calculate area accurately.

Collaborate with peers to solve area-related problems.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum (Primary 4 Mathematics)
State Unified Scheme of Work for Primary 4 Mathematics
New General Mathematics for Primary Schools, Book 4
Federal Ministry of Education Website
Nigerian Educational Research and Development Council (NERDC)

Instructional Materials

The teacher will teach this lesson with the aid of:

Charts showing formulas for area of rectangles and squares.
Cut-out shapes of rectangles and squares.
Squared paper or grid paper.
Real-life objects with rectangular or square surfaces (e.g., textbook cover, whiteboard).

Rationale for the Lesson

Understanding area helps pupils measure and compare the size of surfaces, which is useful in many daily activities like tiling a floor or painting a wall. This lesson enables pupils to apply mathematical formulas to practical situations, developing their problem-solving skills.

Prerequisite/Previous Knowledge

Pupils are familiar with basic plane shapes like squares and rectangles, and can perform basic multiplication operations.

Lesson Content/Board Summary

Area

Meaning of Area

Area is the amount of surface covered by a flat shape or object. It tells us how much space a two-dimensional shape takes up.

Units of Area

The following are standard units used for measuring area:

Square Centimetre (cm²): Used for small surfaces like a page of a notebook.
Square Metre (m²): Used for larger surfaces like a classroom floor or a garden.
Square Kilometre (km²): Used for very large surfaces like a town or a country.

Area of a Rectangle

A rectangle is a four-sided shape with four right angles, where opposite sides are equal in length.

The area of a rectangle is found by multiplying its length by its breadth (or width).

Formula: Area (A) = Length (L) × Breadth (B)

Example: A rectangle has a length of 5 cm and a breadth of 3 cm. Its area is 5 cm × 3 cm = 15 cm².

Area of a Square

A square is a four-sided shape with four equal sides and four right angles.

The area of a square is found by multiplying its length by itself.

Formula: Area (A) = Length (L) × Length (L) or A = L²

Example: A square has a side length of 4 m. Its area is 4 m × 4 m = 16 m².

Finding Small Areas using Unit Squares

Small areas can be found by counting the number of unit squares (e.g., 1 cm by 1 cm squares) that cover the surface of a shape. Each unit square represents 1 square unit of area.

Word Problems involving Area

These are practical problems that describe real-life situations where the area of rectangles or squares needs to be calculated to find a solution.

Quantitative Aptitude on Area

These problems test a pupil’s ability to understand and apply area concepts to solve logical or numerical puzzles related to shapes and their surfaces.

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 greets the pupils and asks them to identify common shapes around the classroom like the whiteboard, door, or window. The teacher then asks what they think “area” means in simple terms, relating it to the space covered by these objects.
Pupils’ Activity: Pupils respond to greetings, identify shapes, and offer their ideas about “area”.
Learning Point: Pupils are introduced to the concept of area and relate it to familiar objects.

Step 2: Meaning of Area and Units

Time: 7 minutes
Teaching Skill: Explanation/Clarification
Teacher’s Activity: The teacher formally defines area as the amount of surface covered by a flat shape. The teacher then introduces the standard units of area (cm², m², km²), explaining when each unit is appropriate, and writes them on the board.
Pupils’ Activity: Pupils listen attentively, take notes, and ask questions for clarification.
Learning Point: Pupils understand the meaning of area and its standard units.

Step 3: Area of Rectangles

Time: 10 minutes
Teaching Skill: Demonstration/Formula Application
Teacher’s Activity: The teacher displays a cut-out rectangle and explains its length and breadth. The teacher then introduces the formula A = L × B, demonstrates how to use it with an example on the board, and solves a word problem involving the area of a rectangle.
Pupils’ Activity: Pupils observe the demonstration, copy the formula and example, and participate in solving the word problem.
Learning Point: Pupils learn how to calculate the area of a rectangle using its formula.

Step 4: Area of Squares

Time: 8 minutes
Teaching Skill: Demonstration/Formula Application
Teacher’s Activity: The teacher displays a cut-out square and explains that all its sides are equal. The teacher introduces the formula A = L × L, demonstrates its use with an example, and solves a simple word problem involving the area of a square.
Pupils’ Activity: Pupils follow the demonstration, copy the formula and example, and practice solving the problem.
Learning Point: Pupils learn how to calculate the area of a square using its formula.

Step 5: Finding Small Areas using Unit Squares

Time: 5 minutes
Teaching Skill: Visualisation/Practical Application
Teacher’s Activity: The teacher distributes squared paper or shows a diagram of a shape made of unit squares. The teacher guides pupils to count the squares to find the area, linking this to the formula method for rectangles and squares.
Pupils’ Activity: Pupils count unit squares on their paper or diagram to find the area.
Learning Point: Pupils understand that area represents the number of unit squares covering a surface.

Step 6: Word Problems and Quantitative Aptitude

Time: 5 minutes
Teaching Skill: Problem-Solving
Teacher’s Activity: The teacher presents a few word problems and simple quantitative aptitude questions involving area on the board. The teacher guides pupils through the steps to identify the shape, formula, and solution.
Pupils’ Activity: Pupils attempt to solve the problems individually or in pairs, with guidance from the teacher.
Learning Point: Pupils apply their knowledge of area formulas to solve practical problems.

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

What is area?
Mention two units for measuring area.
State the formula for finding the area of a rectangle.
A square has a side of 6 cm. What is its area?

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 1 minute
Teaching Skill: Summarization
Teacher’s Activity: The teacher reviews the main points of the lesson, emphasizing the importance of understanding area in daily life. The teacher assigns homework, which may include more practice problems from the textbook.
Pupils’ Activity: Pupils listen to the summary and copy down the homework.
Learning Point: Pupils consolidate their learning and prepare for independent practice.

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

Lesson Keywords

Area – The amount of surface covered by a flat shape.
Rectangle – A four-sided shape with opposite sides equal and four right angles.
Square – A four-sided shape with all sides equal and four right angles.
Length (L) – The longest side of a rectangle or the side of a square.
Breadth (B) – The shorter side of a rectangle (also called width).
Unit Square – A square with sides of 1 unit, used to measure area.
cm² – Square centimetre, a unit of area.
m² – Square metre, a unit of area.
km² – Square kilometre, a unit of area.

Differentiation

For pupils who grasp concepts quickly, the teacher can provide more complex word problems or introduce composite shapes made of rectangles and squares. For pupils needing more support, the teacher can provide additional guided examples, use visual aids like grid paper to count squares, or pair them with faster learners for peer support.

Note for teachers using this lesson plan

Ensure pupils have a solid understanding of multiplication before starting this topic. Use practical examples from the classroom or daily life to make the concept of area relatable. Encourage pupils to always include the correct units (e.g., cm², m²) when stating area. Visual demonstrations with cut-out shapes or drawing on squared paper will greatly help in understanding.