Analisis Kesalahan Siswa Berdasarkan Tahapan Newman dan Scaffolding pada Materi Aritmatika Sosial

The purpose of this study was to identify students' errors based on Newman Stages and scaffolding in social arithmetic material. This research is an action research. The subject of this research is Pangudi Luhur Salatiga class VII students. Data collection techniques used are tests and clinical interviews. The research instrument in this research is the researcher himself and assisted by supporting instrument in the form of test question and interview guide. Data analysis techniques used include transcript of interview result, data reduction, analysis, and triangulation. The result of the research showed that the mistake of the students on the type error I (reading error) of 8.33%, the type of error II (reading comprehension difficulty) of 13.64%, type error III (transform error) of 14.39%, type error IV (weakness in process skill) of 31.82%, error type V (encoding error) of 31.82%. Scaffolding used in this study only until scaffolding at level II. Scaffolding given to type I and II errors is explaining, the scaffolding given to type III errors is explaining and reviewing. Scaffolding given to type IV errors is explaining, reviewing, and restructuring, while the scaffolding given to type V errors is explaining. Keyword: error analysis, social arithmetic, scaffolding