<![CDATA[Abstract: During the Covid 19 pandemic, blended learning became one of the innovations in learning. This study aims to develop blended learning oriented worksheets to train students metacognitive skills on the rate of reaction material. This research method uses the ADDIE model. The instruments used are validation sheets, pre test and post test sheets of metacognitive skills, student response questionnaire, student activity observation sheets, and metacognitive inventory questionnaires. The research subjects were 15 students of class XI MIPA 6 SMAS Al Islam Krian. The student worksheets produced are very valid, with the average content and construct validation results being 87-88 percent. The practicality of worksheets gets a percentage more than 81 percent, which is a very practical category. The effectiveness of worksheets is obtained based on the N Gain score of pre test and post test gets moderate and high results. Thus, conclude that the blended learning-oriented worksheets are very valid, very practical, and effective. Keywords: students’ worksheet, blended learning, metacognitive skills, rate of reaction. Abstrak: Pada masa pandemi Covid 19 ini blended learning menjadi salah satu inovasi dalam pembelajaran. Penelitian ini bertujuan untuk mengembangkan lembar kerja siswa berorientasi blended learning untuk melatihkan keterampilan metakognitif siswa pada materi laju reaksi. Metode penelitian ini menggunakan model ADDIE. Instrumen yang digunakan adalah lembar validasi, lembar pre-test dan post-test keterampilan metakognitif, angket respon peserta didik, lembar observasi aktivitas peserta didik dan angket inventori metakognitif. Subjek penelitian berjumlah 15 siswa kelas XI MIPA 6 SMAS Al lslam Krian. Lembar kerja yang dihasilkan sangat valid dengan hasil rerata validasi isi dan konstruk adalah 87-88 persen. Kepraktisan lembar kerja mendapatkan persentase lebih dari 81 persen, berada pada kategori sangat praktis. Keefektifan lembar kerja ditentukan berdasarkan hasil N Gain pre test dan post-test yang mendapatkan hasil sedang dan tinggi. Dengan demikian, disimpulkan bahwa lembar kerja siswa berorientasi blended learning adalah sangat valid, sangat praktis dan efektif.Kata Kunci: lembar kerja peserta didik, blended learning, keterampilan metakognitif, laju reaksi. DOI: http://dx.doi.org/10.23960/jpmipa/v23i1.pp185-197]]>
