The book gives brief information about approximate and abbreviated calculations, teaches to use office accounts, computational tables, logarithmic ruler, manual, semi-automatic and automatic computers (arithmometer, computers VK-1, VK-2, VK-3). In 2nd edition of the book (1st edition. 1967. ) additionally included calculation tables with fractional degrees, description of 11-scale logarithmic line, disk logarithmic lines . Introduced a new chapter, which describes the computers VK-1, VK-2 and VK-3 and methods of work on them The book is intended for a wide range of readers using tables, simple computing devices and computers .. It can be useful for university students, students of technical schools and secondary schools. Table. 12. IL. 28. List of lit. 23 titles.