History Of Computer (Basic 3 First Term Week 7 )

Early Calculating Device 

Subject   :  Computer Studies


Class : Basic 3 / Primary 3 / Year 3


Term: First   Term


Week : Week 7


Topic  :

History Of Computer Early Calculating Device the Difference Machine



Previous Knowledge : The pupils have previous knowledge of


More Examples of Computer Input Devices 


that was taught in their previous lesson.



Behavioural  Objectives : At the end of the lesson, learners will be able to

1. describe the input early difference machine

2. say the usefulness or the importance of the early counting machine




Instructional Materials 

  • Wall charts
  • Pictures
  • Online Resource
  • Textbooks
  • Keyboard
  • Mouse


Methods of Teaching 

  • Role modelling
  • Questions and Answers
  • Explanation
  • Discussion
  • Recitation
  • Imitation
  • Story Telling
  • Dramatization



The difference machines were the earliest forms of attempts into bringing into the existence of the modern machines that we use now adays.

Difference Engine, an early calculating machine, verging on being the first computer, designed and partially built during the 1820s and ’30s by Charles Babbage.

The following instruments and devices were earlier developed and later transformed to the present day sophisticated intelligent computer system that we know a today


John Napier’s Rod

Blaise Pascal Machine

Leibnitz Calculating Machine.

Leibniz Calculator.

Pascal calculator.

Punched Card

Analytical machine


Charles Babbage (1791-1871) who was known all over the world as the father of computer, was the one that pioneered and designed   two classes of engine which were the Difference Engines, and Analytical Engines.



Presentation : 

The topic is presented step by step

Step 1: The class teacher revises the old topic

Step 2: The class teacher introduces the new topic

Step 3: The class teacher allows the pupils to give their own contributions and gives room for pupils” participation


Class Teacher and Pupils Activities. Interaction or Participation 

This involves class teacher and pupils’ interaction, conversation, imitation or modeling through discussion, play method or just by recitation or asking and answering questions that are related to the topic that has just been taught

  • The class teacher asks the pupils to mention the early counting devices
  • The pupils are shown examples of difference machine on the chart
  • Pupils are encouraged to say what they have been taught about the early difference machine





  1. What are the 5 early calculating devices?
  2. Who created the earliest programmed machine?
  3. Who invented the Abacus?
  4. Who was the father of Computer?
  5. The difference machines were the early counting devices? (True/ False)
  6. Mention two people that were the early inventors of the differences machine
  7. Did people count with stones and sticks in the olden days (True/ False)
  8. Abacus is one of the early counting devices (True/ False)
  9. Can we count with our fingers (True/ False)
  10. Can We count with our hair on our head (True/ False)
  11. Abacus was used for counting (True/ False)
  12. Charles Babbage was a Nigerian (True/ False)



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More Examples of Computer Input Devices ( Basic 3 First Term Week 6 )


Next Lesson 

The Analytical Machine ( Basic 3 First Term Week 8)