Potensi Komunikasi Matematis Siswa dalam Menyelesaikan Soal Open Ended pada Materi Penjumlahan Pecahan Biasa di SMP

: this research aims to reveal the students mathematical communication potential in solving open ended mathematical problem of fraction addition in grade 7 of SMP Negeri 2 Sungai Raya (Junior High School). The method used in this research is descriptive. The form of this research is a case study with the subject of 9 students of class VII C of SMP Negeri 2 Sungai Raya Pontianak which are classified to high, mid, and low achieving students. The following percentages are the students test result in solving open ended mathematical problem of high, mid, and low achieving groups of students presented respectively : 50 % categorized as low; 80 % categorized as very low; 31,67 % categorized as very low