Lembar Kegiatan Siswa merupakan salah satu bahan ajar yang dapat digunakan untuk melatih siswa mandiri dalam belajar. Tujuan dari penelitian pengembangan ini adalah untuk mengetahui kelayakan lembar kegiatan siswa yang valid, praktis, dan efektif. Penelitian ini menggunakan modifikasi model pengembangan 4D yang terdiri dari 4 tahap yaitu define, design, development, dan disseminate. Produk penelitian ini telah dilakukan validasi oleh ahli media, ahli materi, ahli bahasa, ahli desain pembelajaran dan telah dilakukan uji coba keterbacaan, perorangan, kelompok kecil, dan kelompok besar. Hasil kevalidan LKS ditinjau dari rata-rata gabungan validasi ahli sebesar 85,6% dan hasil rata-rata uji keterbacaan 88,60%. Hasil dari kedua titik ukur menunjukkan (valid). Hasil kepraktisan ditinjau dari keterlaksanaan pembelajaran sebesar 89,95% (praktis). Keefektifan diukur menggunakan angket respon siswa, dan perhitungan uji N-gain dari pre-test dan post-test. Angket respon siswa sebesar 91,3% (sangat menarik dan sangat berminat). Perhitungan uji N-Gian sebesar 0.71 (peningkatan tinggi). Hasil dari kedua titik ukur menunjukkan (efektif). Berdasarkan hasil data dapat disimpulkan bahwa pengembangan LKS berbasis problem based learning untuk mengembangkan sikap toleran siswa tema kayanya negeriku kelas IV SDN Mojowarno 1 Jombang layak digunakan.

Student Activity Sheet is one of the teaching materials that can be used to train independent students in learning. The aims of this development research is to find out the feasibility of student activity sheet that are valid, practical, and effective. This study uses a modification of the 4D development model which consists of 4 stages are define, design, development, and disseminate. The product of this research has been validated by media experts, material experts, linguists, learning design experts and has been carried out test of readability, individual, small group, and large group. The result of student activity sheet validity are reviewed from the combined average of expert validation is 85,6% and for reading test is 88,60%. The results of both show that those are (valid). The results of effectiveness are reviewed from learning practice is 89,95% (practical). Effectiveness is measured using student response questionnaire, N-Gain test of pre-test ang post-test. Student response questionnaire is 91,3% (very attractive ang very interested). The calculation of the N-Gain test is 0,71 (high improving). The result of both show that those are (effective). Based on the results of the data it can be concluded that the development of Student Activity Sheet used problem based learning to develop students’ tolerant attitude uses the theme Kayanya Negeriku of the 4th grade in SDN Mojowarno 1 Jombang is worthy to used.

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