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All Journal Mandalika Mathematics and Educations Journal Jurnal Didactical Mathematics
Samosir, Martha Indah
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Education Mathematics

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Analisis Kesalahan dalam Menyelesaikan Soal Cerita Fungsi Kuadrat Berdasarkan Prosedur Newman: Studi Kasus di Kelas XI SMA Sarah, Siti; Siregar, Budi Halomoan; Sitorus, Grace Elicia; Samosir, Martha Indah; Sibarani, Khoirunnisa; Mentari Sukma; Tarigan, Septi Agita; Indah Aulia Pratiwi
Didactical Mathematics Vol. 7 No. 1 (2025): April 2025
Publisher : Program Studi Pendidikan Matematika, Universitas Majalengka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31949/dm.v7i1.11989

Abstract

Tujuan penelitian ini yaitu untuk menganalisis jenis kesalahan yang dilakukan oleh siswa serta penyebab kesalahan peserta didik dalam menyelesaikan soal fungsi kuadrat menggunakan prosedur Newman di SMAS PAB 8 SAENTIS. Penelitian deskriptif kualitatif ini melibatkan 22 siswa kelas XI di SMAS PAB 8 SAENTIS sebagai subjek penelitian. Teknik pengumpulan data yang digunakan adalah observasi, wawancara, tes tertulis, dan dokumentasi. Teknik analisis data yang digunakan yaitu reduksi data, penyajian data, dan penarikan kesimpulan. Hasil penelitian menunjukkan bahwa besar persentase kesalahan peserta didik dalam menyelesaikan soal cerita fungsi kuadrat sesuai prosedur Newman, ialah sebagai berikut : (a) kesalahan membaca sebesar 5,68%, (b) kesalahan memahami sebesar 23,86%, (c) kesalahan transformasi sebesar 15,9%, (d) kesalahan keterampilan proses sebesar 46,59%, dan (e) kesalahan dalam penulisan jawaban akhir sebesar 52,27%. Dengan mengidentifikasi dan memahami berbagai jenis kesalahan yang terjadi, pendidik dapat merancang strategi pembelajaran yang lebih efektif.
Penerapan Media Pembelajaran menggunakan Papan Peluang, Dadu, dan Multimedia Pembelajaran Interaktif dengan Pendekatan RME di SMA Swasta PAB 8 Saentis Percut Kairuddin, Kairuddin; Samosir, Martha Indah; Sitorus, Grace Elicia; Sihotang, Harry Marcel Wahyu; Tanjung, July Yanty
Mandalika Mathematics and Educations Journal Vol 6 No 2 (2024): Edisi Desember
Publisher : FKIP Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jm.v6i2.7821

Abstract

This research aims to implement probability learning media based on Realistic Mathematics Education (RME) at SMA Swasta PAB 8 Saentis Percut. The problem addressed is students' difficulties in understanding the abstract and complex concept of probability. The method used is qualitative with a case study approach, involving observation, interviews, and student satisfaction surveys. The results show significant improvement in students' understanding of probability concepts, as well as increased motivation and active participation in learning. In conclusion, RME-based learning media effectively helps students contextualize and apply probability, enhancing engagement and facilitating deeper understanding.
Analisis Kesalahan Mahasiswa Pendidikan Matematika Dalam Menyelesaikan Soal SUBGRUP Berdasarkan Teori Newman Samosir, Martha Indah; Sitorus, Grace Elicia; Sibarani, Khoirunnisa; Manurung, Sri Lestari
Mandalika Mathematics and Educations Journal Vol 7 No 1 (2025): Edisi Maret
Publisher : FKIP Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jm.v7i1.8788

Abstract

This research aims to examine the types of errors students make when solving problems using Newman's procedure. A qualitative descriptive approach was employed, involving 14 students selected through purposive sampling. Data were collected through observations, written tests, and documentation, then analyzed using Newman's error analysis framework. The data analysis techniques include data reduction, data presentation, and conclusion drawing. The findings indicate that reading errors were the least common (14.28%), while process skills errors occurred most frequently (42.85%). Other types of errors included comprehension errors (21.42%), transformation errors (28.57%), and encoding errors (35.71%). These results suggest that many students struggle with processing information and systematically applying problem-solving skills. Therefore, instructional strategies should focus on strengthening conceptual understanding and providing more practice in translating problems into mathematical representations.
HUBUNGAN KUALITAS TIDUR TERHADAP KONSENTRASI BELAJAR SISWA KELAS VII-3 DI SMPN 4 MEDAN Sitorus, Grace Elicia; Samosir, Martha Indah; Sagala, Prihatin Ningsih; Sibarani, Khoirunnisa; Dhuha, Nadira Kaylana; Munthe, Tiolina Maria
Mandalika Mathematics and Educations Journal Vol 7 No 1 (2025): Edisi Maret
Publisher : FKIP Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jm.v7i1.8790

Abstract

Learning concentration plays a crucial role in students' academic success and can be influenced by various factors, including sleep quality. This study examines the relationship between sleep quality and mathematics learning concentration among seventh-grade students (VII-3) at SMPN 4 Medan. A descriptive correlational method with a quantitative approach was used. Data were collected using a sleep quality questionnaire based on the Pittsburgh Sleep Quality Index (PSQI) and a learning concentration questionnaire. Statistical analysis included the Chi-Square test, Pearson and Spearman correlation, and Odds Ratio estimation. Results showed that 54.5% of students had poor sleep quality, while 45.5% had good sleep quality. Regarding concentration, 54.5% of students exhibited good concentration, while 45.5% struggled to focus. Statistical tests confirmed a significant relationship between sleep quality and learning concentration (p = 0.007), with a moderate positive correlation (r = 0.467). The Odds Ratio indicated that students with good sleep quality were eight times more likely to have high concentration. These findings emphasize the importance of proper sleep habits in improving students' focus and academic performance.
Analisis Kesalahan Mahasiswa Pendidikan Matematika Dalam Menyelesaikan Soal Deret Tak Hingga Berdasarkan Teori Kastolan Sitorus, Grace Elicia; Sibarani, Khoirunnisa; Samosir, Martha Indah; Manurung, Hendra Cahyadi; Simanullang, Michael Christian
Mandalika Mathematics and Educations Journal Vol 7 No 2 (2025): Edisi Juni
Publisher : FKIP Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jm.v7i2.8970

Abstract

This study analyzes errors made by mathematics education students in solving problems related to infinite series, focusing on a topic known for its conceptual and procedural complexity. Based on Kastolan's Theory, this research builds upon previous findings regarding students’ difficulties with infinite series material. A qualitative descriptive approach was employed to analyze the responses of 10 mathematics education students at Universitas Negeri Medan, who had taken or were currently taking the real analysis course, particularly the topic of infinite series. The participants were randomly selected. Data were collected through a structured Google Form questionnaire and two open-ended questions assessing convergence and the summation of geometric series. The errors were categorized into three types: conceptual errors, such as misinterpretation of convergence criteria (10%); procedural errors, including incorrect determination of the ratio (30%); and technical errors, such as calculation mistakes (40%), with percentages calculated using the formula . The findings indicate that while conceptual understanding was relatively sound, technical errors were most prevalent, especially in fraction operations and symbolic manipulation. The study recommends instructional approaches that integrate concept reinforcement, procedural scaffolding, and computational accuracy training. This research contributes to mathematics education by providing empirical evidence on common error patterns in advanced calculus and by encouraging instructors to strengthen teaching strategies that systematically combine conceptual understanding and procedural skills in solving infinite series problems.
Co-Authors Budi Halomoan Siregar Dhuha, Nadira Kaylana Indah Aulia Pratiwi Kairuddin . Manurung, Hendra Cahyadi Mentari Sukma Michael Christian Simanullang Munthe, Tiolina Maria Prihatin Ningsih Sagala Sibarani, Khoirunnisa Sihotang, Harry Marcel Wahyu Siti Sarah, Siti Sitorus, Grace Elicia Sri Lestari Manurung, Sri Lestari Tanjung, July Yanty Tarigan, Septi Agita