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Mathematics is one of the subjects taught at every level of education both in elementary, junior high, high school and university, the science that underlies the development of scientific and technological advances so that mathematics is seen as a structured and integrated science, the knowledge of patterns and relationships, and science. about how to think about making sense of the world around you. This is emphasized within the Government of the Republic of Indonesia through the Regulation of the Minister of National Education (Permendiknas) Number 22 of 2006 concerning Content Standards for Primary and Secondary Education Units (Depdiknas, 2006) that mathematics underlies the development of technological advances, has an important role in various disciplines, and advances human thinking, mathematics is given early in school to equip children with the ability to think logically, analytically, systematically, critically, creatively, and the ability to work together. All these abilities are important provisions and assets needed by children in pursuing a life in a future that is full of challenges and changes rapidly. However, it is unfortunate that today many students have difficulty learning mathematics. Students do not have the desire to try and think at high levels to find solutions to every difficulty found in learning mathematics but instead, as much as possible, always avoid the difficulties they experience, as a result of low student learning outcomes in mathematics. One of the reasons for the low learning outcomes of students' mathematics is because many students consider mathematics to be difficult to learn and mathematical characteristics are abstract so that students consider mathematics to be a frightening specter, reinforced by Sriyanto (2007) who states that mathematics is often considered a frightening specter and tends to be considered difficult lesson by most of the students. Russefendi (1991) also added that mathematics for children is generally a subject that is not liked, is considered a difficult and complicated science, and Abdurrahman (2003) said that of the various fields of study taught in schools, mathematics is the field of study that is considered the most difficult. difficult by students, both those who do not have learning difficulties and even more so for students who have difficulty learning. ABSTRACT

Improving Students' Problem Solving Ability and Mathematical Communication through the Application of Problem Based Learning