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All Journal Perpendicular : Journal of Mathematics Education and Learning
Alfiyah, Khomsyatun
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Decision Sciences, Operations Research & Management Education Mathematics

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Journal : perpendicular journal of mathematics education and learning

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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.
STUDENTS’ CONCEPTUAL UNDERSTANDING OF SYSTEMS OF LINEAR EQUATIONS IN TWO VARIABLES: A DESCRIPTIVE QUANTITATIVE STUDY AT THE JUNIOR HIGH SCHOOL LEVEL Alfiyah, Khomsyatun; Arisa, Nadia
Perpendicular : Journal of Mathematics Education and Learning Vol. 1 No. 2 (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.v1i2.1532

Abstract

This study aimed to analyze junior high school students’ conceptual understanding of Systems of Linear Equations in Two Variables (SLETV) based on conceptual understanding indicators at SMP Fitra Abdi Palembang. Conceptual understanding is a fundamental ability in mathematics learning; however, many students experience difficulties in applying mathematical concepts to contextual problems. This study employed a descriptive quantitative method involving 31 ninth-grade students selected through random sampling. Data were collected using an essay test consisting of seven items aligned with conceptual understanding indicators. The results showed that students’ overall conceptual understanding was categorized as high, with an average score of 60.50. Students demonstrated very high achievement in recognizing and restating concepts (92.47%) and presenting concepts in various representations (83.87%). However, the lowest achievement was found in applying concepts or algorithms to problem-solving (26.89%), indicating difficulties in connecting abstract concepts with real-life situations. These findings suggest that teachers should emphasize learning strategies that promote conceptual application, such as Problem-Based Learning or contextual approaches, to improve students’ ability to apply mathematical concepts meaningfully. This study contributes to mathematics education by providing a detailed profile of students’ conceptual understanding indicators that can serve as a reference for instructional improvement.
Co-Authors Arisa, Nadia Arisa, Nadya