“…All concepts in mathematics have a strong and clear relationship between concepts, so a concept mastery greatly determines the understanding of the other concepts and can be used in problem solving (Ulandari, Putri, Ningsih, & Putra, 2019;Elita, Habibi, Putra, & Ulandari, 2019). The statement of the Ministry of National Education that one of the objectives of mathematics learning at the junior high school level is to carry out the students' ability to understand the concepts, explain the relationships between concepts and apply mathematical concepts in solving mathematical problems (Purwasih, 2015;Oktari, Putra, Putri, & Ningsih, 2018). The Regulation of Minister of Education and Culture No.…”