“…When the literature is examined, the results of the studies on GME show that GME is effective in increasing academic achievement (Lee, 2006;Özdemir & Üzel, 2011;Çakır, 2013;Nama Aydın, 2014;Kaylak, 2014;Özçelik, 2015;Cansız, 2015;Çilingir, 2015;Özkaya, 2015;Demir, 2017;Yetim et al, 2017;Korkmaz & Tutak, 2017;Zakaria & Syamaun, 2017;Erdoğan, 2018;Özkürkçüler, 2019), increased retention (Özçelik, 2015;Demir, 2017;Özkürkçüler, 2018), improved students' problem-solving skills (Verschaffel & De Corte, 1997;Fauzan, 2002;Bonotto, 2005;Çilingir, 2015), improved their attitude towards mathematics (Özkaya, 2015; Özçelik, 2015; Özkürkçüler, 2019) and increased their motivation (Çakır, 2013). In addition, studies are showing that GME has a positive effect on reducing students' mathematical anxiety (Demir, 2017), improves their estimation skills (Bonotto, 2005), eliminates the disconnect between theory and practice (Korthagen & Russel, 1999), provides easy learning (Yorulmaz & Doğan, 2019), improves concept understanding ability (Hadi, 2002;Barnes, 2004;Lestari & Surya, 2017) and communication skills (Cansız, 2015).…”