“…The questions were prepared by considering previous studies in the literature (Goodwin, 2007;Alpaslan, 2011;Gazit, 2013), contents and objectives in the secondary school mathematics textbooks, and historical content in textbooks (Commission, 2011;Aygün et al, 2011a;Aygün et al, 2011b). The content validity of the test was ensured by having it reviewed by one academic with studies on history of mathematics and 2 mathematics teachers.…”