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All Journal JURNAL MATEMATIKA STATISTIKA DAN KOMPUTASI Jurnal Pengajaran MIPA Journal on Mathematics Education (JME) EDU-MAT: Jurnal Pendidikan Matematika Edumatsains REiD (Research and Evaluation in Education) Formatif: Jurnal Ilmiah Pendidikan MIPA JPMI (Jurnal Pembelajaran Matematika Inovatif) Jurnal Akademik Pendidikan Matematika MATHunesa: Jurnal Ilmiah Matematika Journal of Mathematics Instruction, Social Research and Opinion Ta'dib SIGMA DIDAKTIKA: Jurnal Pendidikan Matematika
Yaya S. Kusumah
Universitas Pendidikan Indonesia
Religion Agriculture, Biological Sciences & Forestry Humanities Chemistry Computer Science & IT Education Languange, Linguistic, Communication & Media Mathematics Physics Social Sciences Other

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Bilangan Kromatik Graf Hasil Operasi Korona Sisi Graf Siklus dan Graf Bintang Alivia Alivia; Kartika Yulianti; Yaya S. Kusumah
Jurnal Matematika, Statistika dan Komputasi Vol. 21 No. 2 (2025): JANUARY 2025
Publisher : Department of Mathematics, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/j.v21i2.37361

Abstract

One of the concepts in graph theory that can be analyzed is chromatic numbers of a graph and operation of two graphs. There are various kinds of operations of two graphs, one of which is the corona edge operation. This research aims to determine the chromatic number of the edge corona operation of graph Cn*K1,m  and K1,m*Cn, where Cn is a cycle graph and K1,m is a star graph. The chromatic number is determined based on the pattern formed from several n and m values. The results of this research show that the chromatic number of the edge corona operation of graph Cn*K1,m  is 4 for n= 3, 4, ... k   and m=1, 2, 3, ..., l. The chromatic number of the edge corona operation of graph K1,m*Cn is 5 if n is odd number. and is 4 if n is even number.
Scientific Academic Writing Skills Among University Students: Results from a Self-Assessment Survey Lussy Midani Rizki; Stevi Natalia; Nurafni; Suparman; Darhim Kusumah; Yaya S. Kusumah; Dadang Juandi
EduMatSains : Jurnal Pendidikan, Matematika dan Sains Vol 9 No 2 (2025): January
Publisher : Fakultas Keguruan dan Ilmu Pendidikan, Universitas Kristen Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33541/edumatsains.v9i2.6355

Abstract

This qualitative descriptive study provides a comprehensive profile of scientific academic writing skills among university students enrolled in mathematics education and primary school teacher education programs. Using a self-assessment survey, 110 students evaluated their proficiency across various dimensions of scientific writing, including clarity and coherence, organization of scientific arguments, use of scientific terminology, citation and referencing, critical evaluation of literature, and independent thinking. The data were analyzed using descriptive statistics to identify trends, strengths, and areas for improvement in students' writing skills. The findings revealed that students generally feel confident in their ability to construct clear academic paragraphs and use appropriate vocabulary and tone, but struggle with higher-order writing tasks such as synthesizing information from multiple sources and organizing extended scientific texts. Many students also expressed difficulties in applying proper citation and referencing styles, particularly APA format. Key strengths identified in the study include competence in basic grammar, punctuation, and paragraph structure, while notable weaknesses were found in areas such as critical evaluation, organizing complex arguments, and correct application of citation conventions. These results suggest a need for targeted instructional interventions to help students develop the advanced scientific writing skills necessary for academic success. The study's findings contribute to the ongoing discourse on improving scientific academic writing pedagogy, offering insights for educators to better support students in mastering these critical skills.
Development of Group Investigation-Based Mathematics E-Comic to Improve Mathematical Representation Skills of Junior High School Students Rasilah Rasilah; Yaya S. Kusumah; Dadang Juandi; Dadan Dasari
Journal of Mathematics Instruction, Social Research and Opinion Vol. 5 No. 1 (2026): March
Publisher : MASI Mandiri Edukasi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58421/misro.v5i1.954

Abstract

Mathematics plays a fundamental role in developing logical, analytical, and systematic thinking; therefore, mathematics learning should emphasize not only procedural mastery but also meaningful conceptual understanding. One essential process standard in mathematics learning is mathematical representation, as it enables students to organize ideas, communicate reasoning, and transform abstract concepts into visual, verbal, and symbolic forms. In plane geometry, particularly quadrilaterals, many students experience difficulties in drawing accurate figures, linking geometric properties to formulas, and translating contextual problems into mathematical models. In addition to cognitive challenges, affective factors such as low perseverance and the tendency to give up easily indicate the need to strengthen students’ mathematical resilience. This study aimed to develop a group investigation–based mathematics e-comic for quadrilateral topics at the junior high school level and to examine its feasibility and effectiveness. The research employed a Research and Development (R&D) approach using the ADDIE model, consisting of analysis, design, development, implementation, and evaluation stages. The product was validated by subject-matter experts and media experts and implemented with 32 seventh-grade students at SMP NU Darul Ma’arif. Data were collected through validation sheets, teacher and student response questionnaires, and learning evaluations. The results indicate that the developed e-comic meets high feasibility criteria and receives positive responses from teachers and students. The integration of narrative visuals with group investigation activities enhances engagement, supports students’ understanding of quadrilateral concepts, and encourages active participation and discussion. Therefore, the proposed e-comic is suitable as an alternative learning medium for junior high school mathematics instruction.
NILAI MINIMUM SPAN PELABELAN L(3,1) PADA GRAF HASIL OPERASI COMB ANTARA GRAF BINTANG DAN GRAF SIKLUS Siti Aini; kartika yulianti; Yaya S. Kusumah
MATHunesa: Jurnal Ilmiah Matematika Vol. 13 No. 02 (2025)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Penelitian ini mengkaji pelabelan pada graf hasil operasi comb antara graf bintang dan graf siklus (). Graf hasil operasi comb merupakan graf yang dibentuk dengan menggabungkan beberapa graf menjadi bentuk graf baru. Pelabelan merupakan salah satu jenis pelabelan pada graf yang melibatkan pemberian label pada simpul-simpul graf yang memenuhi aturan , jika dan , jika , untuk . Label terbesar dalam pelabelan graf disebut span. Untuk menentukan rumus dalam mencari nilai minimum span pelabelan pada graf , digunakan metode pendeteksian pola. Metode ini mencari pola nilai minimum label terbesar (span) untuk semua graf . Selanjutnya rumus tersebut dibuktikan secara matematis. Dari hasil penelitian ini, diperoleh nilai minimum span untuk pelabelan pada graf dengan dan , yaitu:
Constructing and providing content validity evidence through the Aiken's V index based on the experts' judgments of the instrument to measure mathematical problem-solving skills Nia Kania; Yaya S. Kusumah; Jarnawi Afgani Dahlan; Elah Nurlaelah; Ferit Gí¼rbí¼z; Ebenezer Bonyah
REID (Research and Evaluation in Education) Vol. 10 No. 1 (2024)
Publisher : Graduate School of Universitas Negeri Yogyakarta & Himpunan Evaluasi Pendidikan Indonesia (HEPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/reid.v10i1.71032

Abstract

Test content-based proof of validity is a type of evidence that supports the validity of a measuring instrument. This research aims to develop a mathematical problem-solving assessment instrument utilizing five experts. This study is classified as developmental research and follows a research design that includes two separate stages: the preliminary design stage and the prototype stage. However, its application is restricted to Prototype 1 and Prototype 2, specifically for expert evaluation. This instrument was designed explicitly for grade VIII students studying mathematics, covering all the topics from the odd semesters. The analysis progressed through three distinct stages "” curriculum analysis, content analysis, and context analysis "” each contributing to a comprehensive understanding of instructional resources. The study sought to narrow the gap between theoretical knowledge and practical application in mathematics education by incorporating real-world context. Surveys have revealed difficulties in answering mathematical problems, highlighting the need to address gaps in learning to improve competency. The careful and thorough construction of test instruments, considering factors such as validity, established the foundation for creating accurate assessment tools. The content validity assessment by the expert panel, with scores ranging from 0.817 to 0.884 based on the V-Aiken category, confirms that the instrument is vital in assessing students' mathematical problem -solving skills, and the implementation of this study yielded many valuable insights for educators and academics. This study helps improve mathematics education resources and evaluations to promote mathematical thinking.
Students’ Mathematical Literacy Based On Visual Learning Style At Junior High School Lussy Midani Rizki; Yaya S. Kusumah; Elah Nurlaelah; Satoshi Kusaka
Jurnal Akademik Pendidikan Matematika Volume 9, Nomor 2, November 2023
Publisher : Program Studi Pendidikan Matematika, Fakultas Keguruan dan Ilmu Pendidikan, Universitas Dayanu Ikhsanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55340/japm.v9i2.1579

Abstract

Mathematical literacy is the ability that students must have to face 21st-century challenges. Related to this, students have learning styles that influence the way students absorb and process information, namely: Visual, auditory, and kinesthetic. This research focuses on describing the mathematical literacy of junior high school students in each indicator classified from the visual learning style. This type of research is descriptive qualitative research. The steps in this study were to compile the learning style questionnaire sheet and mathematical literacy tests; ask students to fill out questionnaires and ability tests; and analyze the results of the learning style questionnaire and student answers on mathematical literacy tests. The subject of the study consisted of 49 class VIII junior high school students, and then the subject was reduced to 6 students. The findings show that: 1) Students with visual learning styles have mathematical literacy in the range of levels 1 to level 2; 2) Visual students have characteristics of answering briefly and difficulty choosing words. The results of this study can be used as consideration in determining treatment in the teaching and learning process in class to increase student mathematical literacy.
Co-Authors Alivia Alivia Dadan Dasari Dadang Juandi Darhim Darhim Darhim Kusumah Diar Veni Rahayu Ebenezer Bonyah Elah Nurlaelah Elsa Komala Fatimah, Siti Ferit Gí¼rbí¼z Isra Nurmai Yenti Jarnawi Afgani Dahlan kartika yulianti Kartika Yulianti Lussy Midani Rizki Lussy Midani Rizki Nelly Fitriani Nia Kania Nita Delima Nurafni Rasilah Rasilah Satoshi Kusaka Siti Aini Stevi Natalia Sugiman Sugiman Sulistiawati Sulistiawati Suparman Syafrianto Syafrianto Tamur, Maximus Yelli Oktavien