01 Mei 2026

Practical Exercise

Learners have learned how to:

  • understand the spreadsheet interface
  • enter and correct data
  • use formulas and functions such as SUM, AVERAGE, MIN, MAX, and MEDIAN
  • edit and format worksheets
  • create charts
Create a worksheet named Student Scores with the following data:


Tasks

1. Enter the data into the worksheet.
2. Add a new column called Average.
3. Use a formula to calculate the average score for each student.
4. At the bottom, calculate:
  • minimum average
  • maximum average
  • median average
  • overall class average
5. Format the table neatly 
  • Using your own creativity - Interesting and yet professional
6. Create a chart that is relevant and explain why you use this type of chart

Creating a Chart

What is a Chart?
A chart is a visual representation of data.

Common Types of Charts
  1. Column chart: compares values
  2. Bar chart: compares categories
  3. Pie chart: shows proportions
  4. Line chart: shows trends over time
Steps to Create a Chart
  1. Select the data.
  2. Click Insert.
  3. Choose a chart type.
  4. Add a chart title.
  5. Edit labels if needed.
Example


Questions
  1. What is the best Chart for This Data
  2. Which item has the highest sales

Editing and formatting a worksheet

Editing a Worksheet
Editing means changing the worksheet content or layout.

Common Editing Actions
  1. insert rows or columns
  2. delete rows or columns
  3. copy and paste data
  4. cut and move data
  5. rename sheet tabs
Formatting a Worksheet
Formatting makes the worksheet easier to read and more attractive.

Common Formatting Actions
  1. bold text
  2. change font size
  3. change text color
  4. fill cell color
  5. add borders
  6. center align text
  7. format numbers as currency, percentage, or date
Example of Good Formatting

For a sales table:
  1. make headings bold
  2. add borders to the table
  3. highlight headings with color
  4. format prices as currency
  5. adjust column width
Exercise 5: Editing and Formatting
Use the table from previous Exercise

Task
  1. Make the headings bold.
  2. Change the heading row color.
  3. Add borders to all cells.
  4. Format the Price and Total columns as currency.
  5. Center-align the headings.
  6. Rename the sheet tab as Sales Data.

Using formulas and functions (min, max, median, average, sum)

What is a Formula?
A formula is an equation used to calculate values in a spreadsheet. Every formula starts with =.

Example:
=B2*C2

What is a Function?
A function is a built-in formula.

Common Functions
SUM = adds values
AVERAGE = finds the mean
MIN = finds the smallest value
MAX = finds the largest value
MEDIAN = finds the middle value

Example Data

Enter this in cells A1:B6:


How to Use Functions

Assume marks are in cells B2:B6.
  1. Total marks: =SUM(B2:B6)
  2. Average marks: =AVERAGE(B2:B6)
  3. Minimum marks: =MIN(B2:B6)
  4. Maximum marks: =MAX(B2:B6)
  5. Median marks: =MEDIAN(B2:B6)
Exercise 3: Functions Practice

Using the marks table above, calculate:
  1. Total marks
  2. Average marks
  3. Highest marks
  4. Lowest marks
  5. Median marks
Exercise 4: Formula Practice

Enter this table in cells A1:C5:


Task
  1. In column D, create a heading called Total.
  2. In cell D2, enter a formula to calculate Quantity × Price.
  3. Copy the formula down to D5.
  4. In D6, calculate the grand total using SUM.

Entering and Correcting Data

How to Enter Data
  1. Click on a cell.
  2. Type the data.
  3. Press Enter.
Types of Data
  1. Text: names, subjects, items
  2. Numbers: marks, prices, quantities
  3. Dates: 12/4/2026
  4. Formulas: =A1+B1
How to Correct Data

Method 1: Double-click the cell
Double-click the cell and edit the content.

Method 2: Use the formula bar
Click the cell, then edit the content in the formula bar.

Method 3: Replace the data
Click the cell, type new data, and press Enter.

Exercise 2: Enter and Correct Data

Enter the following table into a worksheet starting from cell A1:


Task

  1. Change the quantity of Book from 5 to 7.
  2. Change the price of Ruler from 2.00 to 2.50.
  3. Correct Eraser to Pencil.


Spreadsheet Interface What is a Spreadsheet?

 What is a Spreadsheet?
A spreadsheet is a computer program used to organize data in rows and columns. It helps users calculate values, present information neatly, and create charts.

Examples of spreadsheet software:
  • Microsoft Excel
  • Google Sheets
  • LibreOffice Calc
Spreadsheets are useful for students, teachers, businesses, and anyone who works with numbers or lists.

Main Parts of the Interface

a) Workbook
A workbook is the whole spreadsheet file.

b) Worksheet
A worksheet is one page inside the workbook.

c) Rows
Rows run horizontally and are numbered: 1, 2, 3, and so on.

d) Columns
Columns run vertically and are labeled: A, B, C, and so on.

e) Cell
A cell is the box where a row and column meet, such as A1 or B3.

Example:
  • A1 = Column A, Row 1
  • C5 = Column C, Row 5
f) Formula Bar
This shows the content or formula in the selected cell.

g) Sheet Tabs
These are found at the bottom and allow you to move between worksheets.

h) Ribbon / Toolbar
This contains commands such as save, format, insert chart, and functions.

Exercise 1: Identify the Interface (Explain to the person next to you)

Open a spreadsheet application and identify:
  1. Workbook
  2. Worksheet
  3. Row
  4. Column
  5. Cell A1
  6. Formula bar
  7. Sheet tabs
  8. Toolbar or ribbon
  9. Task
Write down the cell reference for:
  1. the cell in column C and row 5
  2. the cell in column A and row 10
  3. the cell in column E and row 2
Conclusion
Spreadsheets are very useful for organizing information, doing calculations, and presenting data clearly. By learning the interface, entering data, using formulas and functions, formatting worksheets, and creating charts, students can perform many basic tasks more easily and accurately.

Step-by-Step Guide with Exercises: Introduction to Spreadsheets

Step-by-Step Guide with Exercises: Introduction to Spreadsheets

By the end of this guide, learners should be able to:
  • identify the main parts of a spreadsheet interface
  • enter and correct data
  • use basic formulas and functions
  • edit and format a worksheet
  • create a chart

23 April 2026

Summary

Summary

The operating system is the core software of a computer.
It helps users:

  • interact with the device,
  • run applications,
  • manage files and memory,
  • process input into output,
  • keep the system working smoothly and securely.

Key terms to remember

  • Operating System (OS)
  • GUI
  • Icon
  • Menu
  • Dialog box
  • RAM
  • Virtual memory
  • Paging
  • Input
  • Output
  • Buffer
  • Spooling
  • Multitasking
  • Foreground
  • Background
  • Desktop OS
  • Server OS
  • Mobile OS

Revision questions

  1. What is an operating system?
  2. State three functions of an operating system.
  3. What is the difference between RAM and virtual memory?
  4. What does multitasking mean?
  5. Give two examples of desktop operating systems.
  6. What is the difference between foreground and background programs?

Features of some operating systems

Windows

  • widely used,
  • supports many applications and devices,
  • includes built-in tools and services.

macOS

  • used on Apple computers,
  • user-friendly and stable,
  • works well with other Apple devices.

UNIX

  • a multitasking operating system,
  • often used in technical and server environments.

Linux

  • based on UNIX,
  • popular for servers and technical users,
  • available in many versions called distributions.

Chrome OS

  • based on Linux,
  • designed mainly for web apps,
  • commonly used on Chromebooks
 

Multiuser operating system

A multiuser operating system allows two or more users to run programs at the same time.

This is commonly used in:

  • servers,
  • organizations,
  • networked systems.

Foreground and background

Foreground

The active program currently being used.

Background

Programs that are running but are not currently being used directly.

Example:

  • Microsoft Word that you are typing in = foreground
  • antivirus scanning quietly = background

Multitasking and single-tasking

Single-tasking operating system

Allows only one program or app at a time.

Multitasking operating system

Allows two or more programs or apps to run at the same time.
Most modern operating systems are multitasking.

Example:

You can:

  • open Google Chrome,
  • listen to music,
  • type in Microsoft Word
    at the same time.

Buffer and spooling

Buffer

A buffer is an area of memory that stores data temporarily while waiting to be sent to an input or output device.

Spooling

Spooling means placing data into a buffer.

Example:

When you print many pages:

  • the data waits in the buffer,
  • the printer prints the pages one by one.

Input and output

Input

Input is any data or instruction entered into a computer.

Examples:

  • keyboard,
  • mouse,
  • touch screen,
  • microphone.

Output

Output is the processed information produced by the computer.

Examples:

  • screen display,
  • printer,
  • speakers.

Simple flow:

Input → Processing → Output

Example:
You type words on a keyboard (input), the computer processes them, and the words appear on the screen (output).

RAM and virtual memory

RAM

RAM (Random Access Memory) is temporary memory that stores open apps, data, and instructions while the device is running.

Important points:

  • More RAM usually means better performance.
  • RAM is used when programs are open and active.

Virtual memory

If RAM is not enough, the OS can use part of the storage medium as virtual memory.

Paging

The process of moving data between storage and RAM is called paging.
Paging is useful, but it is slower than real RAM.

Example:

  • RAM = work desk
  • Storage = cupboard
  • Virtual memory = extra temporary space when the desk is full
 

How an operating system works

The operating system is essential software that:
  • manages the interaction between hardware and software,
  • controls the use of memory,
  • handles input and output,
  • helps process instructions correctly.

Operating system functions

3. Main functions of an operating system

The operating system performs many important tasks, such as:

  • starting and shutting down the computer or device,
  • managing programs and apps,
  • managing memory,
  • coordinating tasks,
  • configuring devices,
  • establishing an Internet connection,
  • providing file management,
  • updating the operating system software,
  • monitoring security,
  • controlling network access.

Simple understanding:

The OS makes sure the computer works in an organized, efficient, and secure way.


4. The role of the OS when using a computer

When you use a computer to do work, the OS helps you:

  • start a word processing program,
  • open a file,
  • add information to the document,
  • save the file,
  • store the file location so you can access it later.

Example:

When you open Microsoft Word and type an assignment:

  • the OS runs the program,
  • the OS manages memory,
  • the OS helps save the file to storage.

5. User interface

The operating system provides ways for users to interact with the computer.

Important terms:

GUI (Graphical User Interface)
A visual way of interacting with a device using icons, buttons, menus, and images.

Icon
A small picture that represents a program, file, or command.

Button
A graphic you click to perform a command.

Menu
A list of related commands or options.

Submenu
A list of additional commands connected to a selected menu item.

Shortcut menu
A list of commonly used commands related to an object.

Dialog box
A box that shows options or asks for input from the user.


6. Controls in a dialog box

A dialog box may contain:

  • Option buttons (radio buttons)
    Allow the user to choose one option only.
  • Check boxes
    Allow a yes/no choice.
  • List boxes
    Show a list of options for selection.

Example:

In print settings:

  • choose page orientation using an option button,
  • choose black-and-white printing using a check box,
  • choose paper size from a list box.

Types of operating systems

1. What is an operating system?

An operating system (OS) is the main software that manages and controls a computer or mobile device.
In simple words, the OS is like the manager of the whole computer system.

Examples of operating systems:

  • Windows
  • macOS
  • Linux
  • Android
  • iOS
  • Chrome OS

2. Why is an operating system important?

Without an operating system:

  • the computer cannot work properly,
  • applications cannot run,
  • users cannot easily interact with the device.

The operating system acts as a bridge between hardware, software, and the user.

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