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All Journal Al-Bidayah: Jurnal Pendidikan Dasar Islam Journal of Sustainability Science and Technology
Nurwidiyanto Nurwidiyanto
Northeast Normal University
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Education Energy Mathematics Social Sciences Other

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THE DEVELOPMENT OF FRACTION TEXTBOOK WITH THE ETHNOMATHEMATICS APPROACH FOR THIRD GRADE STUDENT OF MADRASAH IBTIDAIYAH Linda Indiyarti Putri; Nurwidiyanto Nurwidiyanto; Alfiana Rohmah
Al-Bidayah : jurnal pendidikan dasar Islam Vol 12, No 2 (2020): Al-Bidayah : jurnal pendidikan dasar Islam
Publisher : Universitas Islam Negeri (UIN) Sunan Kalijaga Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14421/al-bidayah.v12i2.535

Abstract

The development of a fraction textbook with an Ethnomathematics approach for the third-grade student of Madrasah Ibtidaiyah (MI) has an urgency to be implemented in fulfilling the alternative needs for learning mathematics textually and realistically. This study aims to determine the effectiveness of fraction material textbooks with an ethnomathematics approach in Madrasah Ibtidaiyah. The population of the study was the third-grade students of MI Roudlotul Huda of Sekaran Gunungpati. The development model is carried out using the concept of development research according to Borg and Gall's 4D model. The sample of this study is using simple random sampling. Product trials were carried out in two class groups, namely IIIA as the experimental class and III B as the control class. The method of obtaining data used questionnaires, tests, and documentation. Then, the early step analysis of the data used the homogeneity and normality test. Furthermore, the data were analyzed using independent samples t-test and paired samples t-test. The product validation analysis results based on the material aspects state that the fraction textbooks with an ethnomathematics approach are suitable to use with a percentage of 75.8% and 75.8% from the material aspect. Meanwhile, response to textbook products in the attractive category obtained a percentage of 89%.
Analysis of formaldehyde content in salted fish at Ciroyom market, Bandung City, Indonesia Candra Utama; Nurwidiyanto Nurwidiyanto; Farhan Baehaki; Sri Ekawati
Journal of Sustainability Science and Technology Vol. 1 No. 1 (2021)
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/josst.v1i1.6

Abstract

Salted fish is one of the processed fish products that are in great demand by the people of Indonesia. This type of preparation has good durability with natural processes. However, there are some cases that use chemicals as preservatives, such as formaldehyde. This study aims to determine the formaldehyde content in salted fish that is traded in the market in Indonesia. This research is descriptive and the sample is taken from Ciroyom Market, Bandung City, Indonesia, randomly. Samples were analyzed qualitatively to observe the physical characteristics of salted fish. In addition, quantitative analysis was also carried out to determine the level of formaldehyde present in salted fish using a UV-Vis spectrophotometer at a wavelength of 520 nm. The results of the analysis showed that 4 of the 15 samples tested contained formaldehyde with a concentration of 0.033 – 0.482 ppm. The characteristics of these samples physically also have similarities with the characteristics of fish containing formaldehyde, namely bright white and hard textured.
Co-Authors Alfiana Rohmah Candra Utama Farhan Baehaki Linda Indiyarti Putri Sri Ekawati