We present in this article the analysis of the probability teaching proposal ofa textbook collectionused in the initial years of Brazilian elementary school, approved by the National Program of Textbooks (PNLD) in 2016. This work is related to the study group of Didactics of the Mathematics (DDMat). As a theoretical and methodological contribution, we used the anthropological theory of didactic, developed by Yves Chevallard and collaborators, that allows us to model and analyze the choices regarding mathematics and didactics present in the teaching of probability in the collection adopted. By the production and analysis of data, we noticed that some notions regarding probability were proposed from the volume referring to the second year of elementary school, in activities about possibilities. The formalization of the probability concept was presented in the last volume of the collection with activities associated with the idea of fraction, ratio and percentage.