eng Science and Education Publishing American Journal of Educational Research 2327-6150 2019-11-28 7 11 888 892 10.12691/education-7-11-20 EDUCATION201971120 article Siti Rukmana Yus sitirukmanayus02@gmail.com 1 S Syafari 2 Ani Minarni 3 Siti Rukmana Yus, Universitas Negeri Medan, Medan, Indonesia Syafari, Universitas Negeri Medan, Medan, Indonesia Ani Minarni, Universitas Negeri Medan, Medan, Indonesia This research aims to: 1) analyze the types of errors made in solving mathematical problems (MP) based on Newman's procedures by students taught through problem-based learning (PBL); 2) to find the cause of errors in completing the MP based on the Newman procedure after PBL implementation. The subjects in this study were students of class VII Middle Secondary School (MSS) MTsN 3 Aceh Tamiang. Subjects for the purpose of in-depth interviews consisted of six students from different mathematical ability: two students with high ability, two students with moderate ability, and two students with low ability. The object in this study is the completion error in the MPS of students who learning mathematics through PBL on the subject of 'algebraic form'. Based on the results of data analysis, the percentage of students' errors in completing MP was: (1) reading error: 10%; comprehension error: 23.33%; transformation error: 36.67%; process skill error: 43.33%; encoding error: 73.33%; (2) Specific types of failure made by students in solving math problems happened in: (1) changing questions into their own language, (2) representing problems in the form of mathematical equations, (3) doing calculations, (4) manipulating algebra problems, and (5) interpreting the solution of the problem. http://pubs.sciepub.com/education/7/11/20/education-7-11-20.pdf types of in solving math problem based on the Newman procedure mathematical problem solving problem-based learning