1. Number systems Importance of
binary number system
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2. Objective
On completion of this period, you would be
able to know:
Number systems
Importance of binary number system
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3. Prerequisites:
What is decimal number system?
Decimal number system is used in our
general counting.
In decimal number system there are ten
digits which are used to form decimal
numbers.
Ten separate symbols 0, 1, 2, 3, 4, 5, 6,
7, 8, and 9
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4. Number systems:
 Number systems are useful in digital computer
technology.
 To perform arithmetic operations.
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5. Number systems (contd):
 A programmer who works on a computer is
allowed to use decimal digits
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6. Number systems (contd):
 Number systems are useful in designing the
digital systems.
 To understand the operation of a computer the
knowledge of binary, octal and hexadecimal
number is essential.
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7. Why computers use binary number
systems?
 In all modern computers, storage and processing
units are made by electronic components which
can only indicate two states i.e. 0(off) or 1(on).
 So binary number system is conveniently used to
express the two possible states.
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8. Why computers use binary number
systems? (contd)
 We can easily design a computer circuit to
process data with binary digits.
 It reduces the cost and improves the reliability.
 Everything that can be done with decimal
system can also be done in binary system.
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9. Number systems used in computers:
 Decimal number system.
 Binary number system.
 Octal number system.
 Hexadecimal number system.
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10. Summary
In this class, you have learnt about
Importance of binary number system in digital
computer systems.
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11. Frequently Asked Questions
1. What is meant by number system ?
2. Why do we use binary number system in
digital computers?
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12. Quiz
1. Binary number system uses
a. 2 digits
b. 8 digits
c. 16 digits
Answer: a
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13. Quiz
2. Decimal number system uses digits
a. 0 and 1
b. 0 to 9
c. 0 to 16
Answer: b
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