Menghadapi tantangan abad 21, siswa diharapkan menguasai keterampilan berpikir kritis. Pembelajaran berbasis masalah mampu melatih keterampilan berpikir. Salah satu perangkat pembelajaran yang mampu meningkatkan keterampilan berpikir adalah LKPD berbasis PBL. Penelitian ini merupakan penelitian R&D dengan mengembangkan LKPD. Model pengembangan yang digunakan adalah 4-D dengan tahapan Define, Design, Develop, dan Disseminate. Instrumen penelitian adalah lembar validasi ahli materi, pembelajaran, dan desain, angket respons guru, angket respon siswa, serta soal pre-test  dan post-test. Produk di validasi oleh ahli materi dengan persentase 90,63 % (sangat layak), pembelajaran dengan persentase 95% (sangat layak), dan desain dengan persentase 88,64% (sangat layak). Hasil respon siswa dengan persentase 90% (sangat layak) pada uji perorangan dan 86% (sangat layak) pada uji kelompok terbatas, hasil respon guru dengan persentase 92,65% (sangat layak). LKPD mampu meningkatkan keterampilan berpikir kritis dengan rata-rata skor pada pretest sebesar 40,26 (rendah) dan posttest sebesar 77,06 (tinggi) dengan N-Gain sebesar 0,57 (sedang).

The Covid-19 pandemic has had a major impact on the order of life, especially in the world of education. Following Government Policy, the face-to-face teaching system is now being transferred to the online system or known as the online system. The problems that arise in choosing the right method to use in the teaching and learning process in the midst of thispandemic are a dilemma for teachers. Some of the alternative applications offered must be adapted to the conditions of the school, teachers and students. The application used must be able to be accessed and understood by every teacher and student so that learning objectives can be achieved. The focus of this research is the use of Google Classroom media in online learning and its advantages and disadvantages. Researchers conducted field research with a descriptive qualitative approach to the learning process in schools. The results show that online learning through Google Classroom has advantages and disadvantages. The advantages include that teachers can use various media for the learning process, both those contained in the Google Classroom or other media that can be linked to the classroom. While the drawbacks are network problems and the limited quota that students have can be an obstacle in the learning process, as well as the low level of student activity in the learning process. Almost 31 students who answered the questionnaire stated that Google Classroom was not very effective because it certainly could not replace face-to-face meetings. Because there are many things that cannot be done through google classroom.