# History of Computer – Early Mechanical Calculating Device – Slide Rule (Primary 3)

Last Updated on September 12, 2020 by Alabi M. S.

COMPUTER STUDIES

(INFORMATION TECHNOLOGY)

BASIC SCIENCE AND TECHNOLOGY

FIRST TERM

WEEK 4

PRIMARY 3

THEME – BASIC COMPUTER OPERATIONS

PREVIOUS LESSON – History of Computer – Early Mechanical Calculating Device (Later Development – Abacus) – Primary 3

TOPIC – HISTORY OF COMPUTER

LEARNING AREA

1. Introductory Activities

2. Early Mechanical Calculating Device – Slide Rule

3. Practical Class on how to use Slide Rule

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 slide rule among all early mechanical calculating devices

2. describe slide rule counting device.

3. operate slide rule counting device.

ENTRY BEHAVIOUR

Counting Devices

INSTRUCTIONAL MATERIALS

The teacher will teach the lesson with the aid of:

Chart showing Slide Rule

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 Early Counting Devices and Later Development Device – Abacus

EARLY MECHANICAL CALCULATING DEVICE – SLIDE RULE

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

SLIDE RULE OR SLIPSTICK

Slide Rule is a ruler that function as mechanical analog computer used for computing multiplication or division, roots, logarithms, and the result of trigonometric functions.

It is also called slipstick.

PRACTICAL DEMONSTRATION USING ABACUS 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 each computing device to the class.

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

3. Demonstrates the use of slide rule.

Pupil’s Activities – Use the slide rule 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 slide rule among early mechanical device.

2. early mechanical calculating devices

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