“…There has been a growing body of research evidence, over the last 30 years, in the area of mathematics teaching connecting effective learning with teachers' knowledge of how children are conceptualising (and misconceptualising) mathematical principles (Ball, Thames and Phelps, 2008;Carpenter, Fennema and Peterson et al, 1988;Greer and Meyen, 2009;Jacobs, Lamb and Philipp, 2010;Maclellan, 2012;Peterson, Fennema and Carpenter et al, 1989;Ryan and Williams, 2007). The recognition of this kind of pedagogical knowledge as relevant for all children connects with inclusive arguments which promote the extension of what is commonly available for all as a means of accommodating difference (Florian and Black-Hawkins, 2011;Hart, Drummond and McIntyre, 2007;Norwich and Nash, 2011;Ylonen and Norwich, 2012).…”