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Number System
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Learning Outcomes
Number System Decimal to Binary Conversion
Binary to Decimal Conversion Operations on Binary Numbers
Although the words, 'data' and 'information' are often used interchangeably, there is an important
distinction between the two words. Data consists of the raw numbers that computers organise to
produce information. In other words, raw facts or figures is data while processed data is information.
From an early age, we are introduced to the concept of numbers and counting. Toddlers learn at
an early age that they can carry two cookies, one in each hand. Kindergarteners begin learning
to count by twos and fives. Invariably, we use the decimal number system. Our number system is
based on 10, most likely because we have 10 fingers. Let us learn more about the number system.
Info Byte
The numerical digits we use today, such as 1, 2, and 3, are based on the Hindu-Arabic
numeral system developed over a thousand years ago.
The number 0 is known by various names, including zero, nought, naught, nil, zilch,
and zip.
i + NUMBER SYSTEM
A number system is a way to express quantities used for counting, comparing amounts,
performing calculations and representing values. A computer represents all kinds of data and
information like text, numbers, audio and video in binary form. The total number of digits used
in a number system is called its base or radix. There are four types of number systems: Binary
number system, Decimal number system, Octal number system and Hexadecimal number system.
Therefore, when someone says that they are working with a number system of radix 2, it means
base 2, that is, the binary number system. The base is written after the number as a subscript
such as (512) . In this example, the number 10 is written as the subscript to express the number
10
in the decimal number system.
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Number System

