# What is the importance of the number system?

In daily lives, people often have to depict, represent or associate certain things or objects with a quantity. This is because of the fact that assigning quantities to certain values or aspects in life makes it easier to compare them with other similar aspects. For example, a teacher grading students’ papers would not label each paper with adjectives like “good”, “better”, “awesome” or “poor”, etc., rather would assign a certain numerical value to that paper based on the student’s performance so that it is easy to assess the knowledge and preparation level of the student, but if the former approach were to be applied, it would lead to utter confusion and no accurate comparison could be made out of it. Since at some point, the teacher would run out of adjectives that are relevant to this particular situation, and it would lead to the same words being used to grade all the unique answers/ responses given by the students. Situations like these call for, rather necessitate the usage of a unique method of valuation, which not only helps recognize the true worth of the object in question but also represents it fairly and non- ambiguously. Such a system which uses certain words or symbols to quantify a given object or value is called the number system.

### Number

A number refers to a word or symbol which represents a particular quantity. It is with the help of numbers only that multiple arithmetic operations are performed and we have been able to develop so much in the field of physics and mathematics. One cannot live their life without the usage of numbers, even for the most basic chores or tasks. Even the money exchanged for commodities is a certain value represented by numbers. A bunch of numbers grouped together is used to assign a person as their contact number. such is the prominence of numerals in our lives. Hence, it is imperative to know more about the numbers and number systems, as has been discussed below.

**Counting Numbers**

Such a set of numbers as is used to count certain objects is called counting numbers. Such a set of numbers starts with 1(one) and goes on till infinity. One here represents a single object. For example, Mr. A had one pencil and one pen in his hand, or I ate one banana today. Adding up two counting numbers yields another counting number. These are used in real life for basic exchange, calculations, and operations.

**The Number Zero **

Zero is denoted by 0. It is used to depict nothing. In other words, if something has no value at all, it is assigned the number zero as a quantity. The number zero comes before all the counting numbers, and forms the set of ‘whole numbers’.

The different types of numbers in mathematics,

**Natural Numbers**A set of numbers as is used to count certain objects are called natural numbers. Such a set of numbers starts with 1(one) and goes on till infinity. It is to be noted that natural numbers include only positive integers.**Whole Numbers**A set of numbers that includes all the positive integers and zero.**Integers**An integer is defined as such a whole number that can assume either positive, negative or no value at all.**Real Numbers**Such numbers which include both rational numbers and their irrational counterparts.**Rational Numbers**Such numbers can be expressed in the form of a fraction.**Irrational Numbers**Such numbers cannot be expressed as a fraction.

The following diagram depicts all kinds of numbers discussed so far,

Apart from the above-mentioned types, we have the following categories of numbers as well,

**Even Numbers**Such numbers as can be divided by 2 are called even numbers. Example: 2, 4, 6, 8, …, 1024, etc.**Odd Numbers**Such numbers as are not divisible by 2 are called odd numbers. Example: 3, 5, 7, 10, …, 1345, etc.**Prime Numbers**Such a number that can be divided exactly by itself or 1. Example: 5, 7, 13, 23, etc.**Composite Numbers**Such numbers as having multiple factors other than 1 and the number itself. Example: 16, 20, 50, etc.

### Number System

It is clear that numbers are used to represent a certain quantity. When certain symbols or digits are used to represent the numbers themselves, it forms a number system. Hence, a number system is such a system as can be used to define a set of values, which are further used to represent a quantity.

**Types of Number Systems**

There are various types of number systems in mathematics. The four most common number system types are:

- Decimal number system
- Binary number system
- Octal number system
- Hexadecimal number system

**Decimal Number System **

Such a number system as has a base value of 10 is termed a decimal number system. It uses the digits between 0 – 9 for the creation of numbers. In this system, each digit is depicted as its product with different powers of 10. Another feature to be noted is that the place value keeps on increasing from right to left, with the extreme right termed as ones, then tens, hundreds, thousands, and so on. The units (ones) place would be depicted as 10^{0}, tens would be 10^{1}, hundreds 10^{2}, and so on.

For example: 548 has place values as

(5 x 10

^{2}) + ( 4 x 10^{1}) + (8 x 10^{0})= 5 x 100 + 4 x 10 + 8 x 1

= 500 + 40 + 8

= 548

**Binary Number System **

As the name suggests, this type of number system has a base value of 2 (binary). This system uses only two digits, i.e., 0 and 1 for creating numbers. Extensively used in computer applications, this system is really east to utilize. For example:

14 can be written as 1110

50 can be written as 110010

**Octal Number System **

As the name suggests, this system has a base value of 8(octal). Hence it uses 8 digits to create numbers. For example:

(112)

_{10}can be expressed as (287)_{8}.(287)

_{10}can be expressed as (372)_{8}.

**Hexadecimal Number System **

This system has a base value of 16 and hence uses 16 digits for the creation of numbers. For example:

(255)

_{10}can be written as (FF)_{16}(1096)

_{10}can be written as (448)_{16}(4090)

_{10}can be written as (FFA)_{16}

### What is the importance of the number system?

It is safe and wise to agree that number system holds its importance for everything which includes proportion and percentage. Number system plays a crucial role, both in our everyday lives and the technological world. With its myriad qualities, it simplifies our lives a lot, which has been discussed as follows:

- It enables to keep count of all the things around people. Like how many apples are in the basket, or the number of milk cartons to be purchased, etc.
- It enables the unique and accurate representation of different types of numbers.
- Making a phone call is possible only because we have a proper and efficient number system.
- Elevators used in public places also depend upon number systems for their functioning.
- Computation of any kind of interest on amounts deposited in banks.
- Creation of passwords on computers, security purposes.
- Encrypting important data, by converting figures into another number system to avoid hacking and misuse of data.
- It enables easy conversion of numbers for technical purposes.
- The entirety of computer architecture depends upon number systems (octal, hexadecimal). Every fiber of data gets stored in the computer as a number.

### Conceptual Questions

**Question 1: Convert 128 _{10} to an octal number.**

**Solution:**

In case of octal conversion, we have to divide the numbers by 8.

OperationOutputRemainder128/8 16 0 16/8 2 0 2/8 0 2

Therefore, the equivalent octal number = 200_{8}

**Question 2: Convert 128 _{10} to hexadecimal.**

**Solution:**

In case of hexadecimal conversion, we divide the numbers by 16.

OperationOutputRemainder128/16 8 0 8/16 0 8

Therefore, the equivalent hexadecimal number is 80_{16}

**Question 3: Convert (1101) _{2} into a decimal number.**

**Solution:**

Now, multiplying each digit from MSB to LSB with reducing the power of the base number 2.

1 × 23 + 1 × 22 + 0 × 21 + 1 × 20

= 8 + 4 + 0 + 1

= 13

Therefore, (1101)_{2}= (13)_{10}

**Question 4: Convert (214) _{8} into a binary number.**

**Solution:**

We know,

2 → 010

1 → 001

4 → 100

Therefore,(214)_{8}= (010001100)_{2}