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2 Number System
Learning Outcomes Let’s Learn About
• Decimal Number System
Students will be able to
• Binary Number System
• explain the need for number system.
• Octal Number System
• list the users of various number systems in computer learning. • Hexadecimal Number System
• convert a value from decimal number system to binary • Computer Arithmeti c
number system and vice versa.
• cite examples of binary and decimal conversions, and
demonstrate them.
Activity Corner
1. What means of counting were used in earlier times?
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2. Name the mathematician who discovered zero (0).
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A number system consists of a set of values. The number system was introduced with the
passage of time. There are four types of number systems. Let’s learn about them in detail.
Decimal Number System
Decimal number system is the most commonly used number system. For example, to know
the number of students in your school, you simply count the students one by one. The number
system used here is the decimal number system.
The decimal number system consists of 10 digits. The base of a decimal number system is 10.
It consists of 0 to 9 digits, for example, 82, –256 and –567. Any quantity greater than 9 is
represented by a contribution of two or more digits.
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