... Regardless of the format in which number symbols are presented, they convey a sense of magnitude, which is the quantity of elements in a set (e.g., Gilmore et al., 2018;Piazza, 2010), and order, which is the sequential position or rank of a number in relation to other numbers (e.g., Goffin & Ansari, 2016;Jacob & Nieder, 2008;Lyons & Beilock, 2011;Lyons et al., 2014). Furthermore, how we process magnitude and order information for number symbols has been found to be related to more complex mathematical skills (e.g., De Smedt et al., 2013;Holloway & Ansari, 2009;Lyons et al., 2016;Merkley & Ansari, 2016;Morsanyi et al., 2017;Sasanguie et al., 2012;Schneider et al., 2016). For example, there is behavioural evidence that order processing of Arabic numerals is significantly related to mathematics achievement in adults (e.g., Goffin & Ansari, 2016;Lyons & Beilock, 2011;Morsanyi et al., 2017;Sasanguie, Lyons, et al., 2017;Vogel et al., 2017;Vos et al., 2017) and children (e.g., Attout & Majerus, 2018;Lyons et al., 2014). ...