Mathematics - Primary 5 - Plane shapes - Area

Plane shapes - Area

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Term: 2nd Term

Week 8

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

SPECIFIC OBJECTIVES:

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

  1. Find the area of regular and irregular shapes and identify the units.
  2. Calculate the area of a right-angled triangle.
  3. Solve real-life problems on the area of regular, irregular, and right-angled triangles.
  4. Solve quantitative aptitude problems related to the area of regular, irregular, and right-angled triangles.

INSTRUCTIONAL TECHNIQUES:

  • Demonstration
  • Group activities
  • Problem-solving approach
  • Use of teaching aids (e.g., shapes, charts)
  • Interactive discussions

INSTRUCTIONAL MATERIALS:

  • Chart with formulas for area
  • Flashcards with different shapes
  • Markers, whiteboard, and erasers
  • Worksheet for exercises
  • Real-life objects (e.g., floor plans, books, etc.) to explain the application of area

INSTRUCTIONAL PROCEDURES:

PERIOD 1 and 2:

PRESENTATION

Step

Teacher’s Activity

Pupil’s Activity

STEP 1 – INTRODUCTION

Introduces the topic by explaining what area is and how it is calculated for regular shapes (e.g., squares, rectangles).

Pupils listen and engage in a short discussion on the concept of area.

STEP 2 – EXPLANATION

Explains how to calculate the area of regular shapes using formulas. Demonstrates with examples on the board.

Pupils follow along and take notes.

STEP 3 - DEMONSTRATION

Demonstrates how to calculate the area of irregular shapes by dividing them into regular shapes (e.g., triangles, squares).

Pupils observe and attempt to calculate the area of irregular shapes in their notebooks.

STEP 4 - NOTE TAKING

Explains the units of area (e.g., cm², m²) and asks pupils to take notes.

Pupils take notes on the different units used for area and examples of regular and irregular shapes.

NOTE (On the Board):

  • Area of Regular Shapes:
    • Square: A= a²
    • Rectangle: A=l x w =
    • Triangle: A=½ b x h
  • Units of Area: cm², m², etc.
  • Example for Regular Shape:
    • Area of square with side 4 cm = A= 4² = 16cm²
  • Example for Irregular Shape:
    • Break into smaller shapes and calculate the area for each.

EVALUATION:

  • Ask pupils to calculate the area of given shapes.
  • Provide worksheets for practice on both regular and irregular shapes.

CLASSWORK:

  • Calculate the area of 5 regular and 3 irregular shapes.

ASSIGNMENT:

  • Find real-life examples of irregular shapes around the house and calculate their area.

CONCLUSION: The teacher praises pupils for participating and encourages them to practice calculating areas of irregular shapes.

 

PERIOD 3 and 4:

PRESENTATION

Step

Teacher’s Activity

Pupil’s Activity

STEP 1 – INTRODUCTION

Recaps the previous lesson on area and introduces the concept of the area of a right-angled triangle.

Pupils recall the concept of area and engage in a discussion on triangles.

STEP 2 – EXPLANATION

Explains how to calculate the area of a right-angled triangle using the formula:

A=½ b x h

Pupils listen attentively and take notes.

STEP 3 - DEMONSTRATION

Demonstrates how to calculate the area of a right-angled triangle using a specific example on the board.

Pupils solve similar problems alongside the teacher.

STEP 4 - PRACTICE

Assigns pupils a set of problems involving right-angled triangles.

Pupils attempt to solve the problems individually.

NOTE (On the Board):

  • Area of Right-Angled Triangle:

A=½ b x h

Where:

    • b is the base
    • h is the height
  • Example:
    • Triangle with base 6 cm and height 4 cm:

A=½ b x h = ½ x 6 x 4 = 12cm²

  • Exercise: Calculate the area of the following right-angled triangles:
    • Base = 8 cm, Height = 5 cm
    • Base = 7 cm, Height = 3 cm

EVALUATION:

  • Ask pupils to solve problems on the area of right-angled triangles using different dimensions.
  • Provide real-life problems for pupils to calculate the area of triangles in objects (e.g., roof of a house).

CLASSWORK:

  • Complete the worksheet on the area of right-angled triangles.

ASSIGNMENT:

  • Solve 5 problems involving the area of right-angled triangles and submit them for review.

CONCLUSION: The teacher thanks pupils for their effort and encourages them to apply their knowledge to real-life situations.