Silalahi, J. D.; Tumanggor, F. L. O.; Syahrial, S. AN ANALYSIS OF STUDENTS’ LEARNING OUTCOMES AFTER THE IMPLEMENTATION OF PROBLEM BASED LEARNING (PBL) IN THE DEVELOPMENT OF MATHEMATICS WORKSHEETS IN ELEMENTARY SCHOOLS: A LITERATURE STUDY. Jurnal Merah Putih Sekolah Dasar, The Indonesian Journal of Primary School Education 2024, 1, 125-139.