“…First, in mastery of mathematics concept and second is about student's thinking skills. Reviewed articles showed that implementation of metacognitive learning strategies by organizing certain activities likes Problem Based Learning, Project Work, Discussion, Game, etc, is mostly effective to students performance and understanding (e.g; Daher, Anabousy, & Jabarin, 2018;Smith & Mancy, 2018;Suriyon, Inprasitha, & Sangaroon, 2013). It means, student learning is greatly enhanced when the student's level of prior knowledge is made visible.…”