99 Percentile in CAT twice. Cleared SSC CGL multiple times securing AIR 206 in SSC CGL 2014. Have attempted Civil Services Mains twice. 

Harshit Dwivedi

A numeral system is a writing system for expressing numbers. These questions dominate the CAT paper so we need to know how to approach these questions. In this course, we'll use previous year papers as a guideline.

Prepare for CAT 2018 through free online videos on Quant, Verbal and DI/LR by learning from the best teachers. Pursue your dream of an MBA from IIM and Top B-schools with lessons from the CAT Toppers 

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Number Systems - CAT Exam

Number System is a very crucial topic of Quantitative Aptitude for CAT exam. These numbers, whether real numbers or rational numbers are important for concept building. Learn Number System from the be

Number Systems

Quantitative aptitude section of CAT exam consists of 34 questions. Learn Quantitative Aptitude from the best teachers and pursue your dream of an MBA from IIMs, IIFT, FMS, MDI and NMIMS among others.

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In this video I have introduced the topic of Prime Numbers to you and have told their properties and important facts. Many more important facts to follow in subsequent videos.

Introduction to Prime Numbers

In this video I have discussed the method of finding whether a number is Prime or not. This method is short and crisp and requires less amount of time. In the next video I am going to tell you the proof of this method.

How to Find Whether a Number is Prime or Not?

In this video I have taken up the proving of the methodology that we used in the previous video to find that whether a number is a prime number or not. This method will also improve your overall understanding of Number System and Mathematics as a whole.

Proving the previous method of finding Prime Numbers

The very basic questions of prime numbers have been discussed here and will give you a complete understanding of this topic.

Prime Numbers Basic Question Solving

Remainder Application while adding, subtracting and multiplying different numbers have been discussed in this video. This video has basics which are very useful in understanding the divisibility rules that will be discussed in the subsequent videos.

Basics of Remainders in Addition Subtraction & Multiplication

In this video I have checked the divisibility rule of 2,4 and have applied the same concept to derive the divisibility rule of 8, 16, 32, 64 and so on and also the remainders.

Divisibility Rule of 2, 4, 8, 16, 32 and so on

Divisibility rule of 3 and 9 and what  the respective remainders would be have been discussed.

Divisibility Rule of 3 & 9

The divisibility rule of 11 has been discussed and the respective remainders proof have been detailed by me in this video. Our aim is to explore why a particular process is happening.

Divisibility Rule of 11

Combined Divisibility Rule of 7, 11 and 13 is a special case which has been discussed by me in this particular video while also telling the shortcut of finding the divisibility and remainder when dividing a six digit number by 7,11 and 13.

Combined Divisibility Rule of 7, 11 & 13

The individual divisibility rule of 7, 11 and 13 have been discussed by me. The proof need not be discussed in this case as you just need to memorise the property to apply in questions.

Divisibility Rule of 7, 11 & 13

In this video I have discussed the divisibility rule of 17, 19 and 23. This strategy is applicable in all cases and you can apply it according to your convenience.

Divisibility Rule of 17, 19 & 23

Divisibility Rule of 29, 31 & 37 have been discussed but not proved. This may become helpful in specific type of questions.

Divisibility Rule of 29, 31 & 37

Divisibility Rule of 41, 43 & 47 have been discussed but not proved. This may become helpful in specific type of questions which directly deal with these concepts.

Divisibility Rule of 41, 43 & 47

How to find least common multiple by division method, Prime factorisation method and multiplication method has been discussed. Also the concept of LCM has also been explained.

LCM: Division, Prime Factorisation & Multiplication Method

A peculiar case of Least Common Multiple type one questions has been discussed which will help you approach questions in the quickest manner and also give you a better understanding of LCM topic.

LCM Type One Question Solving

This is the LCM type 2 concept where we will deduce the respective forms by subtracting the difference of respective divisors and remainders from the LCM of all divisors.

Understanding LCM Type 2 Concept

The questions of LCM type 2 have been solved by me in this video and would clear any remain of your doubts completely.

LCM Type 2 Question Solving

LCM Type 3 cases having two variables have been discussed here. The hit and trial method of solving them has been discussed and explained through two examples.

LCM Type 3 in two variables

The LCM type three model has been discussed for three variables. First with the help of information given I have combined two equations to form one combined equation which I have associated with the third one to form a combined equation fulfilling all the conditions given in the question.

LCM Type 3 in three Variables

The basic questions dealing with concepts of least common multiple have been discussed in this video. How to use them in different questions and types of questions that you will encounter in the exam.

LCM Question Solving

In this video I have first told the basics of Highest Common Factor or Greatest Common Divisor or Greatest Common Factor. After telling the basics I have told how to find the HCF by division method and Prime factorisation method.

HCF/GCD Basics - Division and Prime Factorisation Method

The Highest Common Factor question based on type one concept has been explained which may be directly useful to you in many cases.

HCF/GCD Type One Concept With Examples

Type 2 cases of Highest Common Factor or Greatest Common Divisor or Greatest Common Factor have been discussed here. Here the remainder left is the same and is eliminated in the operation discussed.

HCF/GCD Type Two Concept With Examples

In this video I have solved some questions of LCM and HCF. This is part one question solving.

LCM & HCF Question Solving Part One

In this video I have solved some questions of LCM and HCF. This is part two question solving.

LCM & HCF Question Solving Part Two

LCM & HCF Question Solving Part Three

In this video I have solved some questions of LCM and HCF. This is part four question solving.

LCM & HCF Question Solving Part Four

In this video I have told the formula of calculating the HCF and LCM of fractions and have also solved some questions based on these models.

LCM & HCF of Fractions

The concept of Successive Division has been explained by me in this video. The general formula through different variables has been derived and a proper form has been established which will be utilised to directly solve the questions.

Concept of Successive Division

The concept of successive divisions has been explained with the help of some examples. The variables derivation has been explained in the reverse direction so that it may become a convenient strategy for you in the exam.

Successive Division Question Solving

I have told the basics of prime factorisation. How to do prime factorisation and how to find out the number of factors of a number and why this strategy applies.

Prime Factorisation and Number of Factors of a Number

In this video I have explained how the totient number is used to find out how many numbers less than a number are there which are co-prime with it. In subsequent videos I would be telling how to apply this totient function to more complex cases.

Application of Totient Function to find Co-Primes Less than a Number

In this video I have shown how by applying the concept of totient number I can calculate the sum of all co-primes less than a number.

Sum of all Co-Primes Less than a Number

In this video I have told you how to apply the concept of totient number to different types of questions and the strategy that needs to be deployed while solving the questions.

An Extension of the Application of Totient Function

In this video I would be explaining how to find the sum of all numbers that are less than and co-prime to a particular number by the simple application of totient function.

How to Find the Sum of all Co-Primes by Conventional & Totient Method

In this video I have discussed the logic of why we add one to the powers of prime numbers and multiply them with one another to find the total number of combinations that is FACTORS.

Why the Finding Factors of a Number Formula Works

In this video I have explained how to find out the odd factors of any numbers and also to find out the sum of these odd numbers.

Odd Factors of a Number and their Sum

Even Factors of a Number and their Sum

In this video I have proved the formula of calculating the sum of all the factors of a number. Simple application of geometric progression is involved in it.

Sum of Factors of a Number

Lokesh Agarwal

The Educator will try to cover all types of remainder theorem questions for CAT

Remainder Theorem: CAT

Graduated from Vellore Institute of Technology, Founder of a construction based start-up named UnEarthed

Tanish Khandelwal

This Course includes various concepts, some of which are-
1) Finding Out Unit Digit And Tens Digit of Expression
2) Base System
3) Remainder Theorem
4) Euler Theorem
5) Factors and Factorials.
All of these lessons are designed for CAT aspirants.

(Hindi) Basics of Number System for CAT Aspirants

2 times 99%iler in CAT-Author/SME of Oswaal Books for CAT(MATHS)/Maths faculty at SMI/ FOUNDER of You Tube channel for math's - LETS FIND X.

Nitesh Ranjan Kumar

in This Course, the Educator is Discussing All Type of Problems Related to Remainder, Remainder  Theorem Basic Approach to Solve Problem Related to Remainder.

(Hindi) Problems Based on Remainder - New Concept Never Used Before This Lesson for CAT

Peyush Gautam

You will learn to solve questions from quantitative aptitude section in an easy way with short tricks based on the concepts. This course will be helpful for aspirants of CAT, XAT and other management examinations.

(Hindi) Number System - Quantitative Aptitude for CAT

I have 8 years of teaching experience on APTITUDE & REASONING for different competitive Exam like SSC CAT BANKING RAILWAY.


Jogesh Kumar Pradhan

In this course we will discuss the basic concepts and approch on questions related to pipes and cisterns.

(Hindi) Pipes and Cisterns - CAT

I am a Physics Major and have a deep interest in Mathematics and Statistical analysis, Right now I am trying to help aspirants of CAT

Soumojit Goswami

In this course, the educator is discussing Techniques to Calculate effectively for CAT

Lessons

39 lessons • 5h 34m

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Introduction to Prime Numbers

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How to Find Whether a Number is Prime or Not?

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Proving the previous method of finding Prime Numbers

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Prime Numbers Basic Question Solving

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Basics of Remainders in Addition Subtraction & Multiplication

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Divisibility Rule of 2, 4, 8, 16, 32 and so on

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Divisibility Rule of 3 & 9

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Divisibility Rule of 11

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Combined Divisibility Rule of 7, 11 & 13

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Divisibility Rule of 7, 11 & 13

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