Natural Number Whole number and Negative Integers


Number System - Concepts
Class - RRB Technician Grade I Signal Subjects
 
 
Concept Explanation
 

Natural Number Whole Number and Integers

Natural Numbers:

We know that 1, 2, 3, 4, 5,.... are counting numbers or natural numbers such that 1 is the first natural number and there is no last natural number .The collection of all natural numbers is denoted by N and is written as

       N = [ 1, 2, 3, 4, 5,.....,124]

Whole Numbers:

If we include 0 in the collection of all natural numbers then we will  get 0, 1, 2, 3, 4, 5..... these numbers are called whole numbers. This new collection of whole numbers is denoted by W and is written as

       W = [ 0, 1, 2, 3, 4, 5, ....., 124,.....]

To represent whole numbers on the number line, we draw a line and mark a point O on it as shown in fig. Now, set off equal distances on the right side of the point O and label the points of division as 1,2, 3, 4, 5,.....The point O is labelled as 0.

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Sample Questions
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Question : 1

The whole number that does not have a predecessor is ______________.

Right Option : A
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Question : 2

A quantity which expresses a part of the whole is called a/an ____________

Right Option : A
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Question : 3

Which of the following is not a prime number ?

Right Option : C
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