Melo, W. J. de A. and Teles, R. A. de M. (2020) “The manipulative in conversions between representations of rational numbers and its implications in the phenomena of variability of non-congruence and the non-reversibility”, INTERMATHS. Vitória da Conquista, 1(1), pp. 119-131. doi: 10.22481/intermaths.v1i1.7594.