Numbers for competitive and entrance exams

Numbers is one of the most important topics. Good number of questions are asked in any exam. In most of the exams where quantitative aptitude is a test area, numbers is a key topic. Questions are often perceived to be difficult. But with a clear understanding of the concepts, these questions can be answered easily. Numbers is a big topic and I have covered the topic comprehensively. The following are some of the sub topics covered.

• Classification of numbers
• Divisibility rules
• Number of factors and related concepts
• Number of co-primes and related concepts
• Reversing the digits of a number
• Relation between the sum and the product of numbers
• Squares & Cubes – Important observations
• Index of the greatest power (I.G.P) of a number
• L.C.M and H.C.F
• Successive Division
• How to find the unit’s digit? How to find the last two digits?
• Remainders-Pattern Method, Remainder theorem Method, Binomial theorem method.
• Fermat’s little theorem
• Wilson’s theorem