This research aims to determine the process and results of the development of material-based solutions to improve the mathematical problemsolving skills of elementary school teacher Education Program, Citra Bangsa University. This research is development research with the model ADDIE (Analysis, Design, Development, Implementation, and Evaluation). The subject in this study was 2 expert validators and a limited trial subject of second-semester students, elementary school teacher education, Citra Bangsa University. The study was conducted in the odd semester of 2018/2019. The instrument used is a validity test questionnaire and practicality test. The data analysis techniques used are quantitative and quantifiable descriptive analyses. The results of the development of this resolution-based teaching book are the results of the percentage of basic mathematics teaching book 84% including valid categories, the results of the percentage of test book design validation of 92.5% including a very valid category. Practicality test results showed 88.56% inclusive of very practical category and reliability test result of 0.725 including reliability category.Abstrak: Penelitian ini bertujuan untuk mengetahui proses dan hasil pengembangan bahan ajar berbasis pemecahan masalah untuk meningkatkan kemampuan pemecahan masalah matematika semester II Program Studi Pendidikan Guru Sekolah Dasar, Universitas Citra Bangsa. Penelitian ini merupakan penelitian pengembangan (development research) dengan model ADDIE (Analysis, Design, Development, Implementation and Evaluation).Subjek dalam penelitian ini yaitu 2 validator ahli dan subjek uji coba terbatas yaitu mahasiswa semester II, Pendidikan Guru Sekolah Dasar, Universitas Citra Bangsa Kupang. Penelitian ini dilakukan di semester ganjil 2018/ 2019. Adapun Instrumen yang digunakan yaitu angket uji validitas dan uji kepraktisan. Teknik analisis data yang digunakan yaitu analisis deskriptif kuantitatif dan kualiitatif. Hasil pengembangan buku ajar berbasis pemecahan masalah ini yaitu hasil persentase isi buku ajar matematika dasar 84% termasuk kategori valid, hasil persentase uji validasi desain buku ajar 92,5 % termasuk kategori sangat valid. Hasil uji kepraktisan menunjukkan 88,56% termasuk kategori sangat praktis dan hasil uji reliabilitas yaitu 0.725 termasuk kategori reliabel.