# History of Computer – Early Mechanical Calculating Device – Pascaline or Pascal’s Calculator (Primary 3)

COMPUTER STUDIES

(INFORMATION TECHNOLOGY)

BASIC SCIENCE AND TECHNOLOGY

FIRST TERM

WEEK 6

PRIMARY 7

THEME – BASIC COMPUTER OPERATIONS

PREVIOUS LESSON – History of Computer – Early Mechanical Calculating Device – Stepped Reckoner (Primary 3)

TOPIC – HISTORY OF COMPUTER

LEARNING AREA

1. Introductory Activities

2. Early Mechanical Calculating Device – Pascaline

3. Practical Class on how to use Pascaline

PERFORMANCE OBJECTIVES

By the end of the lesson, the pupils should have attained the following objectives (cognitive, affective and psychomotor) and should be able to –

1. identify Pascaline among all early mechanical calculating devices

2. describe Pascaline counting device.

3. operate Pascaline counting device.

ENTRY BEHAVIOUR

Counting Devices

INSTRUCTIONAL MATERIALS

The teacher will teach the lesson with the aid of:

Chart showing Pascaline

METHOD OF TEACHING – Choose a suitable and appropriate methods for the lessons.

Note – Irrespective of choosing methods of teaching, always introduce an activities that will arouse pupil’s interest or lead them to the lessons.

REFERENCE MATERIALS

1. Scheme of Work

2. 9 – Years Basic Education Curriculum

3. Course Book

4. All Relevant Material

5. Online Information

CONTENT OF THE LESSON

INTRODUCTORY ACTIVITIES

Teacher’s/Pupil’s Review on Stepped Reckoner.

EARLY MECHANICAL CALCULATING DEVICE – PASCALINE

Teacher’s/Pupil’s Activities – Displays Pascaline (if available) or a chart showing Pascaline for the pupils to observe and describe.

PASCALINE

Pascaline is mechanical calculator that perform addition and subtraction of two numbers directly, perform multiplication and division through repeated addition or subtraction.

It is also known as Pascal’s calculator or arithmetic machine.

PRACTICAL DEMONSTRATION USING PASCALINE FOR BASIC ARITHMETIC SUCH ADDITION AND SUBTRACTION

Teacher’s/Pupil’s Activities – if the device is available, call for expert if you are unable to operate the device or watch YouTube video how to use the device.

PRESENTATION

To deliver the lesson, the teacher adopts the following steps:

1. To introduce the lesson, the teacher revises the previous lesson. Based on this, he/she asks the pupils some questions;

2. Shows pictures of Pascaline computing device to the class.

Pupil’s Activities – Bring pictures/cut outs of Pascaline computing devices.

3. Demonstrates the use of Pascaline.

Pupil’s Activities – Use the Pascaline to solve different arithmetic problems.

CONCLUSION

• To conclude the lesson for the week, the teacher revises the entire lesson and links it to the following week’s lesson.

LESSON EVALUATION

Pupils to:

1. identify Pascaline among all early mechanical calculating devices

2. describe Pascaline counting device.

3. operate Pascaline counting device.