Guide for Prepare Aptitude - Postal Assistant Exam

Postal Assistant Exam Preparation Materials - Complete Aptitude Formula

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Theory at a Glance

Introduction 

1. Local Value :

A local value of a number is the face value of that number. For example the local value of 4 in 3248 is 4. 

2. Place Value 

A place value of a number is the value of the place it occupies times its local value. For example the place of 4 in 3248 is forty. 

3. Absolute Value 

The absolute value of a number is the number that remains after neglecting the sign of the given number. Absolute value of a number x is denoted by |x|. So, |x|= x if x is positive |x|= - x if x is negative 

For example 

|35| = 35 and |- 35| = + 35 

Number Types in Numerical Aptitude Tests 

There are ten types of number generally used in numerical aptitude tests. They are: 

1. Even Numbers 

All numbers which can be divided by 2 are called even numbers. 

For example 2, 4, 6, 8… are even numbers. 

2. Odd Numbers 

All numbers which can’t be divided by 2 are called odd numbers, e.g. 1, 3, 5, 7, 9, … are called odd numbers. 

3. Natural Numbers 

The natural flow of numbers starting from 1 are called natural numbers e.g. 1, 2, 3, 4 and so on. 

4. Rational Numbers 

Any number in the form of p/q, where p and q are integers and q ≠0 and p & q are in lowest terms, is called a rational number. The set of all rational numbers is denoted by Q. 

Q = {x:x = p/q; p, q € 1, q ≠0} 

Every integer becomes a rational when we write it in the form of p/q. For example 3 = 3/1, - 8 = - 8/1 

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