“…Studies on number sense have been performed with pre-school students (Aunio et al, 2004(Aunio et al, , 2006Howell & Kemp, 2010;Jordan et al, 2007Jordan et al, , 2010, primary school students from Grade 1 to Grade 4 (Çekirdekci et al, 2016;Mohamed & Johnny, 2010;Olkun et al, 2015;Zanzali & Ghazali, 2002), and elementary school students from Grade 5 to Grade 8 (Akkaya, 2016;Harç, 2010;İymen & Duatepe Paksu, 2015;Kayhan Altay, 2010;Kayhan Altay & Umay, 2013;Lin et al, 2016;Şengül & Gülbağcı Dede, 2013;Torbeyns & Verschaffel, 2016;Yapıcı, 2013), and preservice teachers (Gülbağcı Dede, 2015;Şengül, 2013;Şenol et al, 2015;Yaman,2015aYaman, , 2015b. Among these studies, there are limited number of research works about measuring number sense skills and test development, especially in primary schools.…”