“…The facts show that the majority of students who have students' mathematical problem-solving abilities, both at the secondary and tertiary levels, are still relatively low (Akbar, Hamid, Bernard, & Sugandi, 2017;Ulya, 2015Ulya, , 2016. Many factors cause that the ability of students to solve mathematical problems is not optimal, among them are the learning strategies used (Effendi, 2012;Puadi & Habibie, 2018;Sumartini, 2015), learning device used (Hasibuan, Saragih, & Amry, 2018;Peranginangin, Saragih, & Siagian, 2019;Siagian, Saragih, & Sinaga, 2019), the level of cognitive development of students have not yet reached the formal stage, so students have difficulty understanding abstract mathematical material (Fitriyani, Widodo, & Hendroanto, 2018;Widodo, Istiqomah, Leonard, Nayazik, & Prahmana, 2019), the ability of teachers to provide individual services is not maximal (Annamma, 2015;Elstad & Christophersen, 2017). Relating to the ability of teachers to provide individual services, teachers are expected to be able to clarify student thinking that is adjusted to student characteristics so that students' mindset becomes easier to understand (Fauziyah, Usodo, & Ekana, 2013;Ngilawajan, 2013;Wilkie, 2016).…”