This study aims to describe the planning and implementation of blended learning models based on authentic assessment in PISA-like arithmetic and the ability and obstacles of students in carrying out arithmetic problems similar to PISA with a blended learning model based on authentic assessment. The type of research used is descriptive qualitative. The subjects in this study consisted of six seventh grade students of Muhammadiyah Kartasura Junior High School who had been selected by mathematics teachers at Kartasura Muhammadiyah Junior High School with high, low, and middle ability categories. The data collection techniques used are documentation, tests, and interviews. Technical data analysis consists of data reduction, data presentation, and verification or drawing conclusions. The validity of the data in this study is source triangulation and method triangulation. The results showed that the planning that must be done for its implementation is to prepare learning tools, assessment formats, and assessment instruments. The assessment is carried out in two lessons, namely online and offline. During the learning process, grades are collected from students' activities and work. Students' ability is still lacking in doing arithmetic problems similar to PISA at level four. Students do not understand about loans and bank interest and taxation. The obstacles experienced during learning are time constraints, the proportion of teacher and student numbers is not commensurate, difficult communication, lack of awareness and responsibility of students, and lack of critical thinking skills of students. © 2023 Author(s).
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