Penelitian ini bertujuan untuk mendeskripsikan kelayakan lembar kerja peserta didik berorientasi problem solving untuk melatihkan keterampilan metakognitif peserta didik pada materi asam basa. Kelayakan LKPD meliputi aspek validitas, kepraktisan, dan efektivitas. Jenis penelitian ini menggunakan Penelitian dan Pengembangan (R&D), dan desain penelitian ini menggunakan desain one group pretest-posttest dengan objek yaitu 24 peserta didik kelas 11 IPA 2 SMAN 1 Dawarblandong. Hasil penelitian menunjukkan bahwa lembar kerja peserta didik dinyatakan layak dalam aspek validitas, kepraktisan, dan keefektifan. Validitas dapat diukur dengan lembar validasi isi dan konstruk. Kepraktisan LKPD diukur dengan angket respon peserta didik dan lembar observasi aktivitas peserta didik. Keefektifan LKPD diukur melalui pretest-posttest keterampilan metakognitif, tes ranah pengetahuan, dan didukung oleh angket inventori metakognitif. Persentase validitas isi dari LKPD masing-masing adalah 87,78%. Persentase validitas konstruk dari LKPD masing-masing adalah 86,67%. Hasil angket respon peserta didik memperoleh persentase rata-rata 94,00% dengan kategori sangat praktis dan didukung oleh hasil observasi aktivitas peserta didik dengan memperoleh persentase kegiatan yang relevan pada pertemuan 1, 2, dan 3 masing-masing 93,32%; 93,32%; dan 96,65%. Hasil tes kemampuan metakognitif peserta diik meningkat dengan rentang skor N-gain 0,67-1,00 pada kategori sedang hingga tinggi. Tes ranah pengetahuan meningkat dengan rentang skor N-gain 0,67-1,00 dan didukung oleh angket inventori metakognitif yang diperoleh rata-rata 84,53 dengan kategori sangat baik. Berdasarkan ketiga aspek kelayakan LKPD di atas, dapat disimpulkan bahwa LKPD berorientasi problem solving untuk melatihkan keterampilan metakognitif peserta didik pada materi asam-basa layak digunakan.

This study aimed to describe the feasibility of student worksheets with problem solving oriented to train metacognitive skills on acid base material. The feasibility of student worksheets developed in terms of aspects, namely validity, practicality, and effectiveness. The type of this research used Research and Development (R&D), and the design of this research used one group pretest-posttest design with the objects are 24 students on 11^th grade in science 2 of SMAN 1 Dawarblandong. The results showed that the student worksheets were declared feasible of the validity, practicality, and effectiveness. The validity was measured by the content and construct validation sheets. The practicality was measured by the students responses and average observation of students activities. The effectiveness was measured by pretest-posttest of metacognitive skills, knowledge domain test, and supported by the metacognitive inventory questionnaire. The percentage of content validity from each students worksheets is 87,78%. Construct validity obtained a percentage from each students worksheets is 86,67%. The results of students responses obtained an average percentage of 94,00% in the very practical category and was supported by the results of observations of students activities by obtaining the percentage of relevant activities at meetings 1, 2, and 3 respectively 93.32%; 93.32%; and 96.65%. The results of students metacognitive skills tests increased with a range of N-gain scores of 0.67 to 1.00 in the medium to high category. The knowledge domain test increased with a range of N-gain scores of 0.67 to 1.00 and was supported by the results of the metacognitive inventory questionnaire which obtained an average of 84.53 in the very good category. Based on the three aspects of the feasibility of the students worksheets above, it can be concluded that the problem solving oriented to train students metacognitive skills in acid-base material is feasible to use.