%0 Journal Article %T A hist¨®ria da derivada de Mariana: uma experi¨ºncia did¨¢tica %A Baldino %A Roberto Ribeiro %A Fracalossi %A Aline Schr£¿pfer %J Bolema: Boletim de Educa£¿£¿o Matem¨¢tica %D 2012 %I Universidade Estadual Paulista %R 10.1590/S0103-636X2012000200001 %X in this paper we tell a story for children and adults designed to introduce the concept of derivative as a quotient of infinitesimals. we report on the understanding of 11 and 12-years old girls about the story and the concept. a brief justification for the use of infinitesimals in the teaching of calculus follows, as well as a description of the context of a freshmen calculus course classroom where this story was used as a worksheet. we challenge the calculus teachers and textbook authors to produce something equally accessible for the introduction of the concept of derivative via the theory of limits. %K infinitesimal %K derivative %K differential %K limit %K zoom. %U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0103-636X2012000200001&lng=en&nrm=iso&tlng=en