The recreational mathematics as a tool for learning - Olarrea J; Nuno J; Blasco F (Cisci 2010 - Novena Conferencia Iberoamericana En Sistemas, Cibernetica E Informatica, 7to Simposium Iberoamericano En Educacion, Cibernetica E Informatica, Sieci 2010 - Memorias, 2010)