Class: Junior Secondary School 3 (JSS3, JSS 3)
Term: 2nd Term
Week: 2
Age: 14 years
Duration: 45 minutes
Subject: Basic Science And Technology
Curriculum Theme: Computer Studies
Previous Lesson: Creating Graphs – Line Graphs, Histograms and Pie Charts
Topic: Graphics (Part 2)
Subject Matter: Editing graphs – Formatting graphs, Line graphs, Histograms, Pie charts, Legends, etc.

Specific Objectives

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

Cognitive Domain:
(a) Explain how to edit and format different types of graphs.
(b) Interpret data represented in line graphs, histograms, and pie charts.
Affective Domain:
(a) Show interest and care in presenting data clearly using proper graph formatting.
Psychomotor Domain:
(a) Apply formatting tools to modify graphs accurately on a computer.
(b) Draw and label graphs correctly using software applications.
Social Domain:
(a) Collaborate in groups to prepare and present graphical data effectively.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum
Lagos State Unified Scheme of Work for Junior Secondary Schools
Wikipedia – Graphics
Relevant Textbooks

Instructional Materials

The teacher will teach this lesson with the aid of:

Computer with spreadsheet software (Excel or Google Sheets)
Projector or smartboard
Pre-prepared sample graphs (line graphs, histograms, pie charts)
Markers and chart papers
Printed step-by-step guides for graph formatting

Rationale for the Lesson

This lesson equips pupils with skills to present and interpret data graphically, enhancing clarity in communication and understanding of information.

Prerequisite/Previous Knowledge

Pupils should be familiar with basic concepts of data collection, types of graphs, and using computer software to draw simple graphs.

Lesson Content/Board Summary

Graphics

Editing and Formatting Graphs

Editing graphs involves modifying existing graphs to improve clarity, accuracy, and visual appeal. This ensures that the data is correctly represented and easy to interpret.

The following are common editing features:

Changing chart titles and axis labels
Adjusting colors, fonts, and styles
Modifying gridlines and background
Adding or removing data points

Line Graphs

Line graphs are used to display data trends over time. They connect data points with straight lines to show continuous changes.

Examples are:

Plotting monthly rainfall over a year
Tracking temperature changes daily

Histograms

Histograms are graphical representations of data using bars to show frequency distribution. Each bar represents a range of values.

These include:

Bar height representing the frequency of data
Continuous data grouped into intervals

Pie Charts

Pie charts display data as slices of a circle to represent proportions of a whole. They are useful for showing percentages.

They are:

Labeling slices with percentages or values
Using contrasting colors for clarity
Including a legend to describe slices

Legends

Legends are guides that explain the symbols, colors, or patterns used in graphs. They help the viewer interpret the information correctly.

Examples include:

Colors representing different categories
Symbols differentiating data series

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Visual Aids, Practical/Hands-on, Group Work, Explanation

Instructional Procedures

To deliver this lesson, the teacher will adopt the following steps:

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: Introduce the lesson by asking pupils about previous graphs and their usefulness. Highlight the importance of editing graphs for clear communication.
Pupils’ Activity: Listen, respond to questions, and recall previous knowledge.
Learning Point: Pupils understand the purpose of editing graphs.

Step 2: Editing and Formatting Graphs

Time: 8 minutes
Teaching Skill: Explanation
Teacher’s Activity: Demonstrate editing a sample graph on the computer, showing how to change titles, colors, and gridlines.
Pupils’ Activity: Observe demonstration and note key steps.
Learning Point: Pupils learn to edit graph elements for clarity.

Step 3: Line Graphs

Time: 7 minutes
Teaching Skill: Demonstration
Teacher’s Activity: Present a line graph showing trends and explain how to format it (titles, axis labels, data points).
Pupils’ Activity: Take notes and ask clarifying questions.
Learning Point: Pupils understand line graphs and formatting techniques.

Step 4: Histograms

Time: 7 minutes
Teaching Skill: Explanation and Demonstration
Teacher’s Activity: Show histogram creation, highlight grouping data, and formatting bars.
Pupils’ Activity: Copy steps into notebooks.
Learning Point: Pupils can interpret and format histograms accurately.

Step 5: Pie Charts and Legends

Time: 8 minutes
Teaching Skill: Demonstration and Explanation
Teacher’s Activity: Display pie chart, demonstrate labeling slices, adding legend, and color formatting.
Pupils’ Activity: Follow demonstration, make notes, and participate in discussion.
Learning Point: Pupils understand pie charts and the importance of legends.

Step 6: Note-Taking

Time: 5 minutes
Teaching Skill: Guided Practice
Teacher’s Activity: Summarize key points on the board for pupils to copy.
Pupils’ Activity: Write notes neatly in notebooks.
Learning Point: Pupils have written reference for revision.

Step 7: Evaluation/Review

Time: 5 minutes
Teaching Skill: Question and Answer
Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

Define editing and formatting of graphs.
List three editing features of a graph.
How is a line graph different from a histogram?
What is the purpose of a legend in a graph?
Show steps to format a pie chart.
Pupils’ Activity: Respond to questions and complete mini tasks.
Learning Point: Assess understanding of graph editing and formatting.

Step 8: Conclusion

Time: 5 minutes
Teaching Skill: Recap and Reinforcement
Teacher’s Activity: Summarize the lesson, emphasize key points, and highlight practical application in real life.
Pupils’ Activity: Listen and ask questions for clarity.
Learning Point: Pupils consolidate understanding of graphics editing and formatting.

Lesson Keywords

Graph – visual representation of data
Line Graph – connects data points to show trends
Histogram – bar graph showing frequency distribution
Pie Chart – circular graph representing proportions
Legend – key explaining symbols/colors in a graph

Differentiation

Use visual demonstrations, peer assistance, and step-by-step guides to support both fast and slow learners.

Note for teachers using this lesson plan

Encourage pupils to practice creating and formatting graphs on computers after class. Use real-life datasets to enhance understanding.