Penelitian ini bertujuan untuk menghasilkan LKPD yang layak digunakan sebagai bahan ajar untuk melatihkan keterampilan berpikir kritis materi asam basa yang ditinjau dari validitas isi dan konstruk melalui hasil validasi oleh para ahli, kepraktisan melalui aktivitas peserta didik dan respon peserta didik, serta keefektifan melalui keterampilan berpikir kritis dan hasil belajar peserta didik. Jenis penelitian ini merupakan penelitian pengembangan model Reseach and Development / R&D yang dibatasi hanya sampai pada tahap uji coba produk. LKPD diuji cobakan terhadap 12 peserta didik kelas XI SMA Negeri 1 Sumberrejo Bojonegoro. Berdasarkan data-data penelitian yang didapatkan, LKPD untuk melatihkan keterampilan berpikir kritis peserta didik pada materi asam basa yang dikembangkan layak untuk digunakan,ditinjau dari validitas, kepraktisan, dan keefektifan. Hasil penelitian menunjukkan LKPD yang dikembangkan bersifat valid ditinjau dari validitas isi memperoleh persentase sebesar 91,99% serta validitas konstruk yang terdiri dari kriteria penyajian memperoleh persentase sebesar 88,37%, kriteria kebahasaan memperoleh persentase sebesar 85,79%, dan kriteria kegrafikan memperoleh persentase sebesar 88,45%. LKPD berdifat praktis ditinjau dari hasil observasi aktivitas peserta didik selama tahap uji coba LKPD dengan persentase sebesar 96,36% dan respon peserta didik terhadap masing-masing kriteria yaitu kriteria isi sebesar 94,45%, kriteria penyajian 91,67%, kriteria kebahasaan 91,67%, kriteria kegrafikan 97,23%. LKPD bersift efektif ditinjau dari indikator keterampilan berpikir kritis yang terdiri dari interpretasi memperoleh persentase sebesar 89,72% kategori tinggi, analisis memperoleh persentase sebesar 86,17% kategori tinggi, dan inferensi memperoleh persentase sebesar 92,92% kategori sangat tinggi. Peningkatan hasil penilaian keterampilan berpikir kritis melalui N-gain score sebesar 16,67% mengalami peningkatan dengan kriteria cukup dan 83,33% dengan kriteria tinggi, serta hasil belajar peserta didik 100% mendapat nilai diatas KKM yang ditetapkan di SMA Negeri 1 Sumberrejo yaitu > 75.
Kata kunci: LKPD, keterampilan berpikir kritis, kelayakan, asam basa
This research aims to produce appropriate student worksheet used as a teaching material to train critical thinking skills of acid-base matter that are reviewed from content validity and constructs through the results of validation by experts, practicality through student activities and student responses, and effectiveness through critical thinking skills and learning outcomes of student. The type of this research is the development of Research and Development (R&D) models which are limited to reaching the product trial stage. The student worksheet was tested on 12 students of 11th grade at SMAN 1 Sumberrejo Bojonegoro. Based on the research data obtained, student worksheet to train student critical thinking skills in acid-base matter developed is feasible to use, in terms of validity, practicality, and effectiveness. The results showed that the developed student worksheet was valid in terms of content validity, obtained a percentage of 91.99% and construct validity consisting of presentation criteria obtained a percentage of 88.37%, linguistic criteria obtained a percentage of 85.79%, and graphics criteria obtained a percentage amounting to 88.45%. student worksheet is practical in terms of observations of the activities of students during the testing phase of the student worksheet with a percentage of 96.36% and responses of students to each criterion namely the content criteria of 94.45%, presentation criteria 91.67%, linguistic criteria 91.67%, graphics criteria 97.23%. Effectiveness of student worksheet in terms of indicators of critical thinking skills consisting of interpretations obtained a percentage of 89.72% in the high category, analysis obtained a percentage of 86.17% in the high category, and inference obtained a percentage of 92.92% in the very high category. Increasing the results of the assessment of critical thinking skills through the n-gain score of 16.67% increased with medium category and 83.33% with high category, and the knowledge learning outcomes of students 100% scored above the KKM set at SMAN 1 Sumberrejo, namely >75.
Keywords: student worksheet, critical thinking skills, feasibility, acid base