<![CDATA[This research was aimed to produce the students worksheet based on Problem Solving that valid and practical, and effective to increase students mathematical communication ability. The research subject was grade VII students in MTS Negeri 1 Bandar Lampung in academic year 2017/2018. The design of this research is one group pretest-posttest design. The data of this research were obtained by observation, interview, questioneirs and mathematical communication ability test. Based on the results of the validity by media and material expert and practical test by students and teacher, the students worksheet based on Problem Solving was classified as excellent. The results of the effectiveness of students worksheet show that 75% of students reached KKM and the indeks gain was high. So it can be concluded students worksheet based inquiry was effective to increase the mathematical communication ability of students.Penelitian ini bertujuan untuk menghasilkan LKPD berbasis problem solving yang memenuhi kriteria valid, praktis dan efektif untuk meningkatkan kemampuan komunikasi matematis siswa. Subjek penelitian ini adalah peserta didik kelas VII MTS Negeri 1 Bandar Lampung Tahun Pelajaran 2017/2018. Desain penelitian yang digunakan adalah one group pretest-posttest design. Data penelitian diperoleh melalui angket, dan tes kemampuan komunikasi matematis. Berdasarkan hasil uji kevalidan oleh ahli media, materi dan uji kepraktisan oleh siswa dan guru serta uji efektif dari hasil kemampuan komunikasi matematis, LKPD berbasis Problem Solving tergolong semuanya baik. Hasil analisis kevalidan, kepraktisan, efektifan data menyatakan bahwa LKPD berbasis Problem Solving valid, praktis, efektif, dan hasil indeks gain yang diperoleh dikategorikan tinggi. Disimpulkan bahwa LKPD berbasis Problem Solving valid, praktis, efektif untuk meningkatkan kemampuan komunikasi matematis peserta didik.Kata kunci: Problem Solving, komunikasi matematis, LKPD.]]>
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