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NUMBER SYSTEM
Prime (Ver. 2.2)-VII Learning Objectives
• What is a Number System?
• Number System Conversion
• Operations on Binary Numbers
6 How are data stored inside the computer?
Hi Pihu, computer stores all data such as files, sounds, images, videos, etc., as
numbers in binary form.
Although the words, data and information are often used interchangeably, but there is an
important distinction between the two words. In the strict sense, data consists of the raw
numbers that computers organise to produce information.
From 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 start
counting 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.
Fun • The numerical digits, we use today, i.e., 1, 2, and 3 are based on the
Fact! Hindu-Arabic numeral system developed over 1000 years ago.
• Different names for the number 0 include zero, nought, naught, nil,
zilch, and zip.
What is a Number System?
A number system is simply a method of counting. There are many number systems in existence.
Consider a clock. Clocks have 24 hours, each hour composed of 60 minutes. Each minute is in
turn composed of 60 seconds. When you learnt to count, you used the numbers, like 1, 2, 3, etc.
Similarly, computers also have their own number system, known as the binary number system.

