Silva Filho, Olavo Leopoldino da, Marcello Ferreira, e Danielle Xabregas Pamplona Nogueira. 2020. “The Abacus in the Inquire-Based Learning of Addition and Subtraction”. Plurais - Revista Multidisciplinar 5 (2). Salvador:22-39. https://doi.org/10.29378/plurais.2447-9373.2020.v5.n2.22-39.