About the book: 1989 / Using the example of solving a large number of specific problems, mostly of practical content, it shows how to use mathematical ideas and methods to find a way out from various kinds of difficult situations that may arise in everyday life. Issues of constructing and changing with limited means, finding the optimal solution in a given situation, methods of quick calculation, problems of cutting, pouring, weighing, etc. are considered. For schoolchildren and everyone mathematics lovers For schoolchildren and all mathematics lovers. Source: http://mathemlib.ru/books/item/f00/s00/z0000034/index.shtml