In the 21st century, international interaction in social, economic, cultural, and educational fields has increased. Consequently, international standards have become essential in national education policies, reforms, and practices. As an international assessment, PISA has started to function as a prominent tool in this regard. However, the impact…

Problem-solving is one of the 21st-century skills. However, students still have difficulty solving sequences and series word problems. The purpose of this research is to analyze students' errors in solving sequences and series word problems based on problem-solving steps of Polya. The research method is descriptive qualitative. The research…