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All Journal ETNIK : Jurnal Ekonomi dan Teknik International Journal of Geometry Research and Inventions in Education
Afiyanti, Yunita
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Civil Engineering, Building, Construction & Architecture Economics, Econometrics & Finance Education Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Development of Three-Dimensional Space E-Module with Traditional Javanese Sundanese Culinary Ethnomathematics to Facilitate Students’ Mathematical Spatial Ability Afiyanti, Yunita; Maryati, Tita Khalis; Hafiz, M.
International Journal of Geometry Research and Inventions in Education Vol. 2 No. 01 (2025)
Publisher : EDUPEDIA Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56855/gradient.v2i02.1348

Abstract

Mathematical spatial Ability is the ability of a person to imagine and represent a space. The lack of students' spatial mathematical abilities and the lack of variability of existing teaching materials to support mathematical learning became the background of this study. This study aims to produce e-modules using traditional Javanese Sundanese culinary ethnomathematics to facilitate students' valid, practical, and effective spatial mathematical abilities. The Research and Development method is used with the ADDIE development model (analyze, design, develop, implement, evaluate). The research was conducted on a limited basis by involving XII class students at one of the high schools in the Tajurhalang, Cibinong areas. The research instruments include expert validation sheets, student response metrics, and mathematical spatial ability tests. The results of this study show that the developed e-modules obtained very valid criteria based on expert validator assessments, were very practical based on student responses, and the results were valid. It is effective because students' spatial mathematical ability test results are higher than the school-designated Minimum Completeness Criteria (KKM), so e-modules are suitable for use in mathematical learning to facilitate students' spatial mathematical ability.
Biaya Marginal dalam Penerapan Matematika Ekonomi Afiyanti, Yunita; Ridhoilahi, Iftitah; Nur Azizah, Fajrina; Mardyah Nur Afifah, Ainul; Kustiawati, Dedek
Jurnal Etnik: Ekonomi-Teknik Vol 1 No 12 (2022): ETNIK : Jurnal Ekonomi dan Teknik
Publisher : Rifa'Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54543/etnik.v1i12.131

Abstract

In general, when building a business or business, the main goal is to get the maximum profit. However, besides that, it also uses capital, sacrifices the smallest possible production costs while maintaining the survival and development of the business. Therefore  it is necessary to have a good and structured work plan so that the desired goals can be achieved effectively and efficiently without causing high risks. This study aims to determine the marginal cost as an application of economic mathematics using the literature study method. In this method, researchers examine books and journals related to marginal costs in economic mathematics. The marginal cost of the application of the limit function, the marginal cost is the change in total cost (Q) that occurs due to an increase in production of 1 unit or item. The result of this study is that the limit concept is useful in economics regarding change and the instantaneous rate of change can be used to determine marginal cost. The concept of the marginal is paying attention to the total value or quantity associated with very small changes in the variables that affect it. Marginal cost is the rate of change of total cost due to the addition of one unit of production of goods.
Co-Authors Kustiawati, Dedek M. Hafiz Mardyah Nur Afifah, Ainul Nur Azizah, Fajrina Ridhoilahi, Iftitah Tita Khalis Maryati