Entertaining computer arithmetic. Book 1. Mathematics and the art of counting on computers and without them. GASHKOV S.B.

A variety of number systems are used in mathematics, when there is a need for an account --- starting with exercises of a junior student performed by a pencil on paper, and ending with the calculations made on supercomputers. This book has popularly outlines the issues related to the systems of number, the history of their occurrence and areas of application --- both old and new, both funny and serious. Standard classic and modern quick methods of performing arithmetic and algebraic calculations are described, which can be used both in a manual account and when using a calculator or computer. Most of the book material is available to everyone who is only familiar with the school course of mathematics, but an experienced reader can find something new for themselves in this book.

The book is written on the basis of lectures that the author read at different times Students of the Physics and Mathematics School. A.N. Kolmogorov at Moscow State University, Small and Big Mehmat, as well as at the faculties of information security and computer science of the Russian State University.