Entertaining arithmetic. Riddles and wonders in the world of numbers

Why do people like round numbers? How is the expression “staying on bobs” associated with arithmetic? How to read the thoughts of your friends with matches? What distance is the ray of light overcomes for a millionth fraction of a second? This is only a small part of the curious arithmetic questions, the answers to which you will find in “entertaining arithmetic”.
This book is a fascinating excursion into the history of what ways people considered different eras, cultures and countries and how it was reflected in our reality. At the same time, this is an affordable manual with which you will learn how to add, subtract, multiply and share quickly and without errors. The intricacies of the account and cunning arithmetic tasks in “Entertaining arithmetic” are accompanied by detailed comments and explanatory illustrations