JSS2 Third Term Mathematics Lesson Note – Computer Application

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WEEK 5

TOPIC: COMPUTER APPLICATION

CONTENT:

• Use of punch cards to store information
• Writing familiar words in coded form

USE OF PUNCH CARDS TO STORE INFORMATION

The punch card is a practical application of binary numbers in the development of Information Technology. It is made up of hard paper. The punch cards were used at the onset of Computer Development to store information in form of data bits in columns. The mode of storage used a perforated hole to represent 0 and a cut out slot to represent 1. Examples include:

Figure 1 shows the storage of information about a man named Mr. Bello who is 36 years old.

Figure 2 shows a punch tape which is an improvement on the punch cards as it can store a greater amount of information. It has 8 columns with each column having 0s (holes) and 1s (cut-outs). The first three columns are used for specific instructions while the last 5 are used for general instructions.

Class Activity

1. What is the major difference between a punch card and paper tapes.
2. Before the advent of punch cards and tapes, what do you think were used to store information?

WRITING FAMILIAR WORDS IN CODED FORM

Recall the conversion of numbers in base 10 to binary, those binary conversions can be used to store numeric information as follows:

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