PROFIL KOMUNIKASI MATEMATIKA TULIS SISWA SMP DALAM MEMECAHKAN MASALAH MATEMATIKA DITINJAU DARI KEMAMPUAN MATEMATIKA SISWA

One factor in learning mathematics is the need for communication skills. Carpenter & Gorg (2000: 60) states "Communication is an essential part of mathematics and mathematics education", which means that communication is an important part of mathematics and mathematics education. Mathematical communication is related to problem solving, because with the existence of mathematical communication students will understand better in solving mathematical problems. This qualitative descriptive study aims to describe the written mathematics communication of junior high school students in solving mathematical problems in terms of students' mathematical abilities. The data obtained came from three subjects, namely VIII grade junior high school students who had received the material system of two-variable linear equations (SPLDV). The three subjects consisted of students with high mathematical abilities, students with moderate mathematical abilities, and students with low mathematical abilities. The results of this study are the accuracy of writing mathematics for high ability and medium ability students is declared accurate, but low abilities is not declared accurate. In the completeness aspect, high ability and medium ability students written mathematics communication is complete for any information that has been submitted. But, student with low abilities is not complete. In the aspect of fluency, students with high abilities are able to communicate fluently in mathematics, but students with moderate and low abilities cannot fluently. . Keywords: Mathematical Communication, Problem Solving, Mathematical Ability.