Lesson Notes By Weeks and Term - Primary 3

History of computer II


Subject: ICT

Class: Primary 3

Term: 1st Term

Topic: History of computer II

Subtitle: Mechanical counting devices

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

  1. state the uses of Abacus.
  2. mention inventors of mechanical counting devices

Resources and materials:

Scheme of work

Online information

Instructional material: charts

Building Background/connection to prior knowledge: pupils are familiar with the topic in their previous classes.



The first computer was called the Abacus counting machine.

Early mechanical counting devices and their inventors

  1. Abacus

The first computer was made several years ago by a man called Abacus. It was used for simple additions and subtractions. It is known as theAbacus counting machine.


  1. Blaise Pascal

A Frenchman called Blaise Pascal made the first adding machine in 1642. It was a very big machine. Blaise Pascal’s father used this machine in recording taxes collected and spent by the government.

  1. Sir Samuel Morland

Sir Samuel Morland, an Englishman, invented three calculating machines between 1663 and

  1. The first one was used for addition and subtraction of money. The other two were used for more difficult arithmetic.
  1. Charles Babbage

Charles Babbage, another Englishman, made the first machine that calculates and stores information. His computer was better than an ordinary calculator. It was a very big machine.

Charles Babbage is therefore known as the father of the computer.


Strategies& Activities:

Step1:Teacher revises the previous topic.

Step2:Teacher introduces the new topic.

Step3:Teacher explains the new topic.

Step4: Teacher welcomes pupils’ questions.

Step5: Teacher evaluates the pupils.

Assessment & Evaluation:

  1. The first adding machine was invented in what year?
  2. Abacus is use for……………. And …………….

WRAP UP(CONCLUSION) Teacher goes over the topic once again for better understanding.


  1. Name five counting devices people used before the invention of computer.

Write to inventors, their invention and the use of their invention.

© Lesson Notes All Rights Reserved 2023