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Perpendicular : Journal of Mathematics Education and Learning
Published by CV. Doki Course and Training
ISSN : 31092934     EISSN : 31091032     DOI : https://doi.org/10.61994/perpendicular
Core Subject : Science, Education,
Decision Sciences, Operations Research & Management Education Mathematics
Focus - Perpendicular : Journal of Mathematics Education and Learning is a scientific journal published by CV. Doki Course and Training. The papers to be published in Perpendicular are research articles (quantitative or qualitative research approaches), literature studies or original ideas that are considered to contribute to scientific studies of Mathematics Education and Learning. Scope - Perpendicular : Journal of Mathematics Education and Learning calls for scientific articles on Mathematics Education and Learning. It covers problems in Analysis, Algebra, Teaching and learning, Instruction and curriculum, Teacher education, Education technology, School effectiveness, Learner characteristics, Inclusive education, Geometry, Statistics, Applied mathematics, Economic Mathematics, Economics. It is published two times a year, in June and December. There are two version of publication; print out (p) with ISSN: and electronic (e) with ISSN Online:
Arjuna Subject : Matematika - Matematika (Lain-Lain)
Articles 5 Documents
 1 
DEVELOPMENT OF MATHEMATICS INSTRUCTIONAL VIDEOS FOR 8TH GRADE STUDENTS Arisa, Nadya; Alfiyah, Khomsyatun
Perpendicular : Journal of Mathematics Education and Learning Vol. 1 No. 1 (2025): Perpendicular : Journal of Mathematics Education and Learning
Publisher : CV. Doki Course and Training

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61994/perpendicular.v1i1.905

Abstract

This study investigates the feasibility, practicality, and effectiveness of instructional mathematics videos supported by YouTube as an alternative learning medium for 8th-grade students. The research adopted the Research and Development (R&D) approach using the Borg and Gall model. Data were collected through expert validation, student questionnaires, and achievement tests. Instruments used included a validation rubric for media and material quality, a Likert-scale questionnaire for practicality, and a multiple-choice test to assess effectiveness. Effectiveness was categorized using a theoretical framework based on percentage classifications. The video scored 92% in media quality and 91% in material relevance, placing both in the “Very Valid” category. Small-group trials showed 88.8% practicality based on student feedback. Field tests indicated an effectiveness score of 72.9%, demonstrating improved student performance. The YouTube-based video is a valid, practical, and effective tool for mathematics instruction. It offers significant potential in engaging learners and enhancing conceptual understanding.
MATHEMATICAL REASONING ABILITY OF STUDENTS AT SMA NEGERI 1 BELINYU ON THREE-DIMENSIONAL GEOMETRY Alfiahni, Sri; Harfiyani
Perpendicular : Journal of Mathematics Education and Learning Vol. 1 No. 1 (2025): Perpendicular : Journal of Mathematics Education and Learning
Publisher : CV. Doki Course and Training

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61994/perpendicular.v1i1.906

Abstract

This study aims to analyze the mathematical reasoning ability of 12th-grade students at SMA Negeri 1 Belinyu on three-dimensional geometry. Using a quantitative descriptive method, data were collected through essay tests and interviews. Results showed that students had moderate mathematical reasoning ability, with an average score of 47.14%. Among four measured indicators, students performed best in presenting mathematical statements (65.83%) and constructing proofs (61.39%), but poorly in identifying patterns (38.33%) and drawing conclusions (16.39%). These findings indicate the need for instructional strategies that emphasize critical thinking and structured reasoning. This research contributes to understanding students’ difficulties in spatial reasoning and supports curriculum development for geometry learning.
STUDENTS’ MATHEMATICAL PROBLEM-SOLVING ABILITIES IN ALGEBRAIC EXPRESSIONS AT SMP NEGERI 48 PALEMBANG Husen, Sadam; Jumroh
Perpendicular : Journal of Mathematics Education and Learning Vol. 1 No. 1 (2025): Perpendicular : Journal of Mathematics Education and Learning
Publisher : CV. Doki Course and Training

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61994/perpendicular.v1i1.908

Abstract

This study aims to assess the mathematical problem-solving abilities of students at SMP Negeri 48 Palembang in the topic of algebraic expressions. The research sample was selected randomly, consisting of 25 students. Data collection was conducted using essay-format test questions. The research employed a quantitative descriptive method. Based on data analysis and discussion, it can be concluded that students' mathematical problem-solving abilities are categorized as moderate, with an average score of 67.90. The students' abilities in solving problems based on specific indicators are as follows: understanding the problem (74.33), planning the solution (74.67), executing the plan (65.00), and interpreting the results (59.00).
THE EFFECT OF THE INDONESIAN REALISTIC MATHEMATICS EDUCATION (PMRI) APPROACH ON PROBLEM-SOLVING ABILITIES AND LEARNING MOTIVATION OF GRADE VII STUDENTS AT SMP NEGERI 2 AIR SALEK Wahida, Miko Yoga
Perpendicular : Journal of Mathematics Education and Learning Vol. 1 No. 1 (2025): Perpendicular : Journal of Mathematics Education and Learning
Publisher : CV. Doki Course and Training

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61994/perpendicular.v1i1.909

Abstract

This study aimed to investigate the effect of the Indonesian Realistic Mathematics Education (PMRI) approach on students' mathematical problem-solving abilities and learning motivation. A true experimental design was employed with a posttest-only control group. The sample consisted of 72 students (36 experimental, 36 control) selected through random sampling. Data were collected using a problem-solving ability test and a learning motivation questionnaire (30 items, 5-point Likert scale). The instruments were validated through expert review and pilot testing, achieving a Cronbach’s alpha of 0.89 for the questionnaire. Independent t-tests revealed a significant difference in problem-solving ability between the experimental and control groups (t = -9.62, p < 0.001). However, learning motivation results did not show a statistically significant difference (t = -6.20, p = 0.269). The findings suggest that PMRI enhances students’ problem-solving abilities but may require longer intervention periods to influence motivation.
ENHANCING STUDENTS' INTEREST IN LEARNING MATHEMATICS THROUGH THE IMPLEMENTATION OF PROBLEM-BASED LEARNING: A CLASSROOM ACTION RESEARCH Rahayu, Sri Mulya; Afisah
Perpendicular : Journal of Mathematics Education and Learning Vol. 1 No. 1 (2025): Perpendicular : Journal of Mathematics Education and Learning
Publisher : CV. Doki Course and Training

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61994/perpendicular.v1i1.939

Abstract

This classroom action research aims to enhance students' interest in learning mathematics through the implementation of the Problem-Based Learning (PBL) model in Class X.6 at SMA PGRI 2 Palembang during the 2024/2025 academic year. The study was conducted in two cycles, each consisting of planning, action, observation, and reflection. The participants comprised 37 students. Data collection involved interviews, observations, questionnaires, field notes, and documentation. The average observation score for student interest increased from 65.28% in the first cycle to 78.73% in the second. Questionnaire data showed a rise from 82.32% to 86.81%. These results indicate that PBL effectively improves students' interest in learning mathematics.

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