# Category: Number System

## How to find remainder – 2 : Fermat’s little theorem

So continuing discussion from our last post How to find remainder – 1 – Euler’s theorem, now we will discuss Fermat’s little theorem which can be easily used in questions where the divisor is...

## How to find remainder – 1 – Euler’s theorem

To find the remainder when a number having a big power is divided by another number may seem to be a difficult, probably impossible, task but if you know certain sequential method to solve...

## Graph Modification

Sometimes we come across questions related to graphs modification. These questions may look difficult in the first sight but are really easy to crack if we know some of the fundas. The questions may be...

## Nature and sign of the roots of a quadratic equation

Nature of the Roots As I mentioned earlier in the post “Roots of a quadratic equation” that Discriminant helps in determining the nature of the roots of a quadratic equation ax^2 + bx +...

## Roots of a Quadratic Equation

A quadratic equation is a polynomial equation of the second degree. In other words, a second degree polynomial in x equated to 0, where coefficient of x^2 =/=0 will be a quadratic equation. The general form is ax^2 + bx...

## Squares of numbers from 1 to 30

For making your calculation faster you must remember the squares of  numbers from 1 to 30. Here is a collection of squares which could be easily remembered. Sq. 1 = 1          ...

## Speed up your calculation 1

All MBA exams require fast calculation. Even 5-10 seconds saved per question will save you enough time to solve 3-4 more problems ultimately resulting in a better score. So following things can be handy...

## Last digit of a product of numbers with power.

Last digit of a product of any number of numbers is equal to last digit of product of last digits of all the numbers. So to find the last digit in this case first...

## Last digit of a sum of numbers with power.

Last digit of a sum of any number of numbers is equal to last digit of sum of last digits of all the numbers. So to find the last digit in this case first...

## Last digit of any power of a number

To find the last digit of any power of a number we should keep following in mind. 1. Last digit of any power number repeats after a certain interval say N. So N is...

## How to deal with tricky quadratic and cubic equation

So today lets discuss how to solve the problems related to quadratic and cubic equations. Though these problems are simple but a bit tricky. Similar approach is required in each and every problem. First...

## A small Divisibility Trick for any number

Sometimes it becomes very cumbersome to check the divisibility by the conventional methods specially in case of 7, 11, 13…. etc. Since the divisibility methods corresponding to these numbers takes good amount of time,...

## Is √x² = x or -x or none.

Crawl through various forums of mathematics & MBA preparation  and you will find people searching for a clue whether √x² = x or -x or what …. Now to solve this situation, always remember in...