In this research, we present a study about the translation of mathematical language into the Brazilian Sign Language - Libras, discussing the language games present in deaf education. Our main goal is to investigate how the deaf student translates texts in mathematical language into sign language. Therefore, we seek support in the concepts of language games and see how of the second moment of Wittgenstein's philosophy. We selected these concepts to believe that the deaf student uses the ways of seeing the mathematical language that is by writing, as well as the way he deals with other languages that are intertwined with it such as Portuguese and Libras and that manifest themselves in many language games that involve mathematics learning of deaf students. At a first moment the methodology is characterized by a bibliographic search, drawn upon for the readings linked to the philosophy of language, deaf education, inclusion and mathematical language. In a second moment, a field research with deaf students of the 1st year of high school in order to check on in loco how they do a translation of mathematical language into sign language in the classroom. From the qualitative approach, we found that deaf students use of predominant form the reference model of language, in other words, a word-sign, which often fail to understand the real meaning of the word in the mathematical statement.
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