This research is motivated by the number of errors made by students in solving math problems. The purpose of this study was to determine the types of errors made by students in working on math problems based on Watson's criteria in class IX.8 and to determine the factors that caused students to make mistakes in doing math problems based on Watson's criteria in class IX.8. The research method used is descriptive method with a qualitative approach. The sampling technique used is purposive sampling technique. The sample in this study consisted of 32 students, for further research from the existing sample, namely 5 students according to the level of academic ability and certain considerations. The results of this study indicate that the types of errors made by students with high academic abilities are incorrect procedures and missing conclusions. The types of errors of moderate ability students are missing data, wrong procedures and missing conclusions. The types of errors made by students with low academic ability are inaccurate data, wrong procedures, missing data and missing conclusions. The cause of students making mistakes is that students do not understand the questions, students are confused in answering questions and forget to use the correct formula. So it can be said that the error in reading mathematical stories is in accordance with Watson's Criteria.

This study aims to evaluate the validity of the Sigil application-based E-Module on statistics material so that it can be used as a source of learning mathematics, especially on statistics material. This type of research is classified as development research (Research & Development/R&D) with the development model proposed by Plomp. However, this research is limited to the validity stage of the E-Module only. The e-module was validated by 3 experts consisting of 2 material experts and 1 media expert. The instrument used in this research is a validity questionnaire. Data validity was tested using a Likert scale. The results of the study show that the results of the validity of the Android-based E-Module using Sigil are 89,83%.

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This research is motivated by the low ability of students’ mathematical problem solving and students’ cognitive style in solving problems. the purpose of this study was to determine how thw mathematical problem solving ability in term of the reflective abd impulsive cognitive style of class VIIB students of SMPN 4 South Solok. This type of research is descriptive research with a qualitative approach. The sampling technique used was purposive sampling. The research instrument was in the form the Matching Familiar Figure Test (MFFT), mathematics problem-solving ability test and interviews. Data analysis techniques using qualitative data analysis techniques are data reduction, data presentation and drawing conclusios. The result showed that who had the criteria of problem solving ability and reflective cognitive style of class VIIB students as many as 9 people consisting of 1 person who had low and very low problem solving ability criteria. Students who have the criteria of problem solving ability and cognitive style of class VIIB students are 6 people sonsiting of 1 person who has low problem solving ability criteria and very low people.ABSTRAK                              Penelitian ini dilatarbelakangi oleh rendahnya kemampuan pemecahan masalah matematika siswa dan gaya kognitif siswa dalam menyelesaikan masalah. Tujuan penelitian ini adalah untuk mengetahui bagaimana kemampuan pemecahan masalah. Tujuan penelitian ini adalah untuk mengetahui bagaimana kemampuan pemecahan masalah matematika ditinjau dari gaya kognitif dan impulsive siswa kelas VIIB SMPN 4 Solok Selatan. Jenis penelitian deskriptif dengan pendekatan kualitatif. Teknik pengambilan sampel menggunakan purposive sampling. Instrumen penelitian berbentuk tes Matching Familiar Figure Test (MFFT), tes kemampuan pemecahan masalah matematika dan wawancara. Teknik analisis data yang menggunakan teknik analisis data kualitatif yaitu reduksi data, penyajian data dan penarikkan kesimpulan. Hasil penelitian menunjukkan bahwa siswa yang memiliki kriteria dari kemampuan pemecahan masalah dan gaya kognitif reflektif siswa kelas VIIB 9 orang yang terdiri 1 orang memiliki kriteria kemampuan pemecahan masalah rendah dan sangat rendah 8 orang. Siswa yang memiliki kriteria kemampuan pemecahan masalah dan gaya kognitif impulsive  kelas VIIB sebanyak 6 orang yang terdiri 1 orang yang memiliki kriteria kemampuan pemecahan masalah rendah dan sangat rendah 5 orang.