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Calculations done mentally in short steps and that too quickly is mentally stimulating. The book as the name suggests is based on finding short cut calculation techniques for all possible calculations under the sky. Calculations required in shops in markets are also explained lucidly. Calculations required for an average corporate sector guy are also covered exhaustively. Accurate multiplications, divisions as well as approximate ones are also shown. Be it finding a kgs price when 150 gms is purchased to calculating previous days share price from current price are shown and explained in simple terms. The main focus of the book is to strech to cover all possible calculations required under the sky and second is easy comprehensibility and third is quick time in doing the calculations. The book may be required surely for competitive exam students who sit for GMAT, CAT( India), and other aptitude tests. The book is also a huge learning experience for all, children and adults alike as calculations are taught in this book to be done mentally and quickly without the help of calculators.