About the Author(s) Anthea Roberts Schools Development Unit, University of Cape Town, Cape Town, South Africa Kate le Roux Academic Development Programme, University of Cape Town, Cape Town, South Africa Citation Roberts, A., & Le Roux, K. (2019). Erratum: A commognitive perspective on Grade 8 and Grade 9 learner thinking about linear equations. Pythagoras, 40(1), a519. https://doi.org/10.4102/pythagoras.v40i1.519 Note: DOI of original article: https://doi.org/10.4102/pythagoras.v40i1.438 Erratum Erratum: A commognitive perspective on Grade 8 and Grade 9 learner thinking about linear equations Anthea Roberts, Kate le Roux Published: 05 Dec. 2019 Copyright: © 2019. The Author(s). Licensee: AOSIS. This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. In the version of this article published earlier, the date of publication reflected the incorrect year. The publication date, under the heading ‘Dates’, should have been 28 March 2019 instead of 28 March 2018. This correction does not alter the study’s findings of significance or overall interpretation of the study results. The publisher sincerely apologises for any inconvenience caused.