High Quality Content by WIKIPEDIA articles! The Man Who Calculated (original Portuguese title: O Homem que Calculava) is a book on recreational mathematics and curious word problems by Brazilian writer Júlio César de Mello e Souza, published under the pen name Malba Tahan. Since its first publication in 1949, the book has been immensely popular in Brazil and abroad, not only among mathematics teachers but among the general ublic as well.The book has been published in many other languages, including Catalan, English (in the UK and in the U.S.), German, Italian, and Spanish, and is recommended as a paradidactic source in many countries. It earned his author a prize by the Brazilian Literary Academy.