“…The role of textbooks as an opportunity to learn has received considerable attention in the research literature on the teaching and learning of K-12 mathematics. Among other things, this research has investigated students' opportunity to learn about mathematical topics such as linear functions and trigonometry (Wijaya et al, 2015), addition and subtraction of fractions (Alajmi, 2012;Charalambous et al, 2010), calculus (Haghjoo et al, 2023), probability (Jones & Tarr, 2007), statistics (Pickle, 2012), reasoning and proof (Stylianides, 2009;Thompson et al, 2012), proportional reasoning (Dole & Shield, 2008), and deductive reasoning (Stacey & Vincent, 2009).…”