<![CDATA[The purpose of this research is to develop teaching materials of worksheet, to know the interest of worksheet learning materials, and to know the difference of learning result of student mathematics after using worksheet based on discovery learning. The method used is research and development method using experimental design of One Group Pre Test - Post Test Design. Data collection techniques used test and questionnaire techniques. The research population is 259 students and the sample of research is 88 students of Grade III Elementary School of Gadingrejo. The data analysis used Mann Whitney U test, the learning result data were from non-distributed population. The result of the research) the realization of the product is the development of worksheet, attractiveness of worksheet materials in improving student learning achievement, And there is a significant increase study results of students before and after using lks discovery worksheet based learning.Tujuan penelitian ini adalah mengembangkan bahan ajar LKS, mengetahui ketertarikan bahan ajar LKS, dan mengetahui perbedaan rata-rata hasil belajar matematika siswa setelah menggunakan LKS berbasis discovery learning. Metode yang digunakan adalah metode research and development dengan menggunakan desain eksperimen One Group Pre Test Post Test Design. Teknik pengumpulan data menggunakan teknik tes dan angket. Populasi penelitian berjumlah 259 orang siswa dansampel penelitian adalah 88 orang siswa kelas III SD Negeri Gadingrejo. Analisis data menggunakan uji Mann Whitney U, data hasil belajar tidak berdistribusi normal.Hasil penelitian adalah terwujudnya produk berupa pengembangan LKS, kemenarikan bahan ajar LKSdalam meningkatkan hasil belajar Matematika siswa, dan ada peningkatan signifikan hasil belajar siswa sebelum dan sesudah menggunakan LKS LKS berbasis discovery learning.Kata Kunci: Discovery Learning, Hasil Belajar Siswa, LKS]]>
