“... richtet sich in erster Linie an Mathematik-Interessierte und erzählt in leichter und unterhaltsamer Form eine Geschichte der Zahlen ... Jedes Kapitel ist voll von interessanten Fakten, überraschenden Beispielen, gelösten und offenen Problemen, persönlichen Schicksalen und amüsanten Anekdoten, und es ist spannend von der ersten bis zur letzten Seite ...” (G. Karigl, in: Internationale Mathematische Nachrichten, Jg. 231, 2016) "The target reader of this book is a senior high school student. It is well suited to such an audience; indeed, it is exactly the sort of work I would myself have devoured some 50+ years ago. … The different topics treated are all described exactly and succinctly." (Michael A. B. Deakin, Mathematical Reviews, Issue 2008 j) “The author gives a history of the development of numbers including the natural numbers, the rational numbers, the real numbers and the complex numbers. The text is written at a level appropriate for any educated person. Throughout the text the reasons for the development of various numbers are given along with a historical view of the intuitive struggles with these new ideas.” (Steven T. Dougherty, Zentralblatt MATH, Vol. 1188, 2010)