Touchpad Plus Ver. 3.1 Class 4

By Geeta Zunjani

Computer Science Textbook Designed for Joyful Learning

KEY FEATURES
- National Education Policy 2020
- Tech Funda: This section provides a practical information or tip to the students.
- Clickipedia: This section provides interesting computer facts.
- Lab Session: This is a lab activity to develop practical skills. (Subject Enrichment)
- Explore More: This section contains supplement topics for add-on knowledge.
- QR Code: Scan the QR Code given on the first page of each chapter to start chapter animation.
- Mind Boggler: This section has puzzle or fun based activity to help understand the concepts better.

DESCRIPTION
Touchpad PLUS (Version 3.1) series based on Ubuntu 20 and LibreOffice 7 is designed carefully keeping in mind the overall growth of the child.

The books contain updated topics like 3D Printing and Artificial Intelligence that will definitely give our students an edge above others and hence make programming ideas more innovative and creative.
Learning is done best when it’s fun-filled and activity based. To ensure that the content intrigues the students at all times and keeps them interested throughout the course of the book, we have included interesting key features like Student Corner, Tech Funda, Clickipedia, Comp Caution, Restart, Checkpoint, Mind Boggler, Hands-On, Subject Enrichment—Lab Session, Teacher’s Note, Periodic Assessment, Test Sheet, Project Work, Speech Drill and Glossary.

WHAT WILL YOU LEARN
You will learn about:
- Digital World
- Cyber World
- Coding World
- Computational Thinking
- Artificial Intelligence

WHO THIS BOOK IS FOR
Grade - 4

TABLE OF CONTENTS
1. Evolution of Computers
2. Personalizing Linux/Ubuntu
3. Know about Computer Viruses
4. Editing Text in LibreOffice Writer
5. Formatting in LibreOffice Writer
6. Introduction to LibreOffice Impress
7. Introduction to Internet
8. More on Scratch
9. Visual Processing
10. Evolution of AI
11. Project Work
12. Explore More (Latest Trends)
13. OGO Cyber Sample Questions
14. Glossary

• Language: English
• Publisher: Orange Education Pvt Ltd
• Release date: Jan 20, 2021
• ISBN: 9789390475209

Book preview

1 EVOLUTION OF COMPUTERS

Dear Students! You have learnt about computers in your previous class.

Computer is a familiar word for you today. But have you ever thought ‘Who invented the computer?’ This machine is an outcome of labour of a number of minds. No particular person can be credited with the invention of computers, but several names stand out in the crowd.

early counting tools

Since ancient times, people have invented tools for calculations. Early man tied knots in a rope and carved marks on clay in order to keep the records. They also used to count with the help of fingers, toes, pebbles, stones, sticks, bones, etc.

Early Counting Tools

abacus—first calculating device

Abacus

The first step towards computing was the invention of Abacus around 3000 years ago, in China. It is a wooden frame with beads on parallel wires which can do simple calculations like addition and subtraction. This device is used to calculate numbers at a fast speed.

Pascaline Adding Machine

Pascaline

Blaise Pascal

In 1642, a mathematician, Blaise Pascal invented the calculating machine called the Pascaline adding machine. The numbers were fed into the machine by dialing them on the wheels. This device is believed to be the first mechanical calculator of the world. This machine was capable of performing only addition and subtraction.

Leibniz step reckoner

Leibniz Step Reckoner

In 1672, a mathematician, Gottfried Wilhelm Leibniz invented the digital mechanical calculator called ‘Step Reckoner’. It was the first calculator that could perform all four arithmetic operations i.e., addition, subtraction, multiplication and division.

charles babbage’s analytical engine

Charles Babbage

In 1822 a mathematician, Charles Babbage developed a steam driven calculating machine, that was the size of a room, which he called the Difference Engine. But even after working on this project for 10 years, this machine never became a reality.

In 1833, he invented a machine called the Analytical Engine, the first ever working model of a mechanical computer, a fully program controlled machine. This is why Charles Babbage is known as the ‘father of computers’.

Analytical Engine

Lady Ada Lovelace’s Programs

The instructions given to Babbage’s Analytical Engine were in the form of 0’s and 1’s and the first person to introduce this concept was Lady Ada Lovelace. Since she was the first to introduce the concept of programming, she is known as the first computer programmer.

Lady Ada Lovelace

Herman Hollerith’s Tabulating Machine