# Concept

## Estimation of Numbers

We do estimation so that calculation gets easier.Estimation is done when you don’t require exact answer and approximate calculation is sufficient for you. For example:Population of City A is 55,923Population of City B is 67,432 And we are asked to find total population of City A & B;So we are required to calculate ==> 55,923 …

## Using Comma in numbers

In Indian System we use commas to mark thousands, lakhs and crores.Commas help us understanding the number value faster. In the future when you all grow up, you will have to visit bank for personal and professional reasons. That time this concept will help you to identify number faster Example 1Analyze use of commas in …

In order to play with numbers, you should know how to read number first.In this post, we will provide you with tools with the help of which number reading gets easy. Read 257 Step 1: First we will mark numbers for better identification STEP 2: Read number with the help of markingsYou can see that …

## Making Greatest and Smallest Numbers

You should know how to make greatest and smallest numbers if individual digits are provided to you. This theory may not have practical implication but this will help you to develop strong concept of numbers Example 01Make Greatest and Smallest four digit numbers from the digits 7, 8, 3, 5The digit should not be repeated …

## Concept: Remainder Theorem

Suppose you are asked to find remainder of following expression Person with average math skills will do all the calculation and come with the answer.But the Question can be easily solved using Remainder Theorem REMAINDER THEOREM In this process, you have to individually calculate each values and write the remainders This way you can easily …

## Concept: Number of Zeros in Factorial Value

CONCEPT 1 Suppose you are given a number in factorial numbers and you are asked to find number of zeros possible in that factorial. In questions involving number of zeros, you have to find the possible combination of (2 * 5) For example:Find number of zeros in 6! 6! can be written as 6 ! …

## Concept: Number of Zeroes in Expression

The number of zero’s in any expression depends on number of combination of (2 *5) present in that expression.Hence zeros are formed by the combination of 2 & 5 For Example; Suppose you are asked to find number of zeros in following expression8 * 15 * 23 * 17 * 25 * 22 Step 1: …

## Concept: Number of Factors of number

Let us suppose you have given number 240 to find the number of factors Factor representation of 240 is Using conventional method, you can find number of factors by manual calculation So using this old method we can figure out that there are total 20 factors of number 240.But this method is tedious and consumes …

## Concept: Sum of Factors of number

Sum of Factors CalculationLet us suppose that you are asked to find the sum of all the factors of a number. Let the number be 240Factor representation of 240 will be like From the above representation, we can write total factors as You can see from the above calculations, there are 20 numbers which divide …

## Concept: Factors and its calculations

What are Factors of a number?Factors of any numbers are basically the digits which will fully divide that particular numberFor Example: 1. Factor of 6 are: 6=> 2*3 Here 2 and 3 are the digits which will fully divide number 6 Hence, 2 & 3 are factor of number 6 2. Calculate Individual factors of …