The present study aims at examining the use of open-ended approach in cultivating senior high school students' mathematical creative thinking ability (MCTA) and self-esteem (SE) in mathematics viewed from school category. The subjects of this research were the students grade XI at three schools; a high, middle and low group in Kota Serang, Banten Province. In every school category, two classes were chosen; one class was the experimental group which was taught by the open-ended approach, while another class was a control group which was shown by conventional way. This quasi-experimental research employed MCTA test and SE in mathematics scale as the instruments. In general, the research result shows that the MCTA improvement and SE level of the students who are taught by open-ended approach are better than those who are taught conventionally. The results of students' MCTA and SE viewed from school category will be further discussed. Keywords: mathematical creative thinking ability, self-esteem, open-ended approach AbstrakPenelitian ini bertujuan untuk mengkaji pendekatan open-ended untuk meningkatkan kemampuan berpikir kreatif matematis (KBKM) dan self-esteem (SE) dalam matematika pada siswa SMA ditinjau dari ketagori sekolah. Subjek penelitian ini adalah siswa kelas XI pada tiga sekolah dengan kategori sekolah tinggi, sedang dan rendah di Kota Serang Provinsi Banten. Pada tiap kategori sekolah dipilih dua kelas, satu kelas menjadi kelas eksperimen yang menerapkan pendekatan open-ended, dan satu kelas lainnya sebagai kelas kontrol yang menerapkan pendekatan biasa. Instrumen penelitian kuasi eksperimen ini adalah tes KBKM dan skala SE. Hasil penelitian secara umum menunjukkan peningkatan KBKM dan pencapaian SE siswa yang mendapatkan pembelajaran open-ended lebih baik dari pembelajaran biasa. Disajikan juga pembahasan mengenai peningkatan KBKM dan pencapaian SE siswa tersebut ditinjau dari tiap kategori sekolah.Kata Kunci: kemampuan berpikir kreatif matematis, self-esteem, pendekatan open-ended

This study is a series of Didactical Design Research in prospective analysis stage to comprehensively identify some obstacles in learning negative integer in order to capture how the learning process used by teachers and how the impact on students in understanding the concept of negative numbers. This research is a case study administered to seventh-grade students in one of the classes in a junior secondary school in Indonesia to investigate how the teacher managed the learning process of integers and identify students' thinking construction. Involving a mathematics teacher and 37 students, this qualitative study collected data from field observations, interviews and document review. The data were analyzed by the perspectives of learning obstacles based on Theory of Didactical Situation. Findings show how teacher describes the negative integers and the arithmetic concepts to the students and its contribution in causing misunderstanding on the students. Within the framework of epistemological obstacles, the result of this study is used as a basis for designing a learning program which can overcome problems related to teaching and learning of negative integers.

Changes in climate and land use land cover (LULC) are important factors that affect water yield (WY). This study explores which factors have more significant impact on changes in WY, spatially and temporally, within the Citarum River Basin Unit (RBU), West Java Province, Indonesia with an area of ±11.317 km2. The climate in the area of Citarum RBU belongs to the Am climate type, which is characterized by the presence of one or more dry months. The objectives of the study were: (1) To estimate a water yield model using integrated valuation of ecosystem services and tradeoffs (InVEST), and (2) to test the sensitivity of water yield (WY) to changes in climate variables (rainfall and evapotranspiration) and in LULC. The integration of remote sensing (RS), geographic information system (GIS), and the integrated valuation of ecosystem services and tradeoffs (InVEST) approach were used in this study. InVEST is a suite of models used to map and value the goods and services from nature that sustain and fulfill human life. The parameters used for determining the WY are LULC, precipitation, average annual potential evapotranspiration, soil depth, and plant available water content (PAWC). The results showed that the WY within the territory of Citarum RBU was 12.17 billion m3/year, with mean WY (MWY) of 935.26 mm/year. The results also show that the magnitude of MWY in Citarum RBU is lower than the results obtained in Lake Rawa Pening Catchment Areas, Semarang Regency and Salatiga City, Central Java (1.137 mm/year) and in the Patuha Mountain region, Bandung Regency, West Java (2.163 mm/year), which have the same climatic conditions. The WY volume decreased from 2006, to 2012, and 2018. Based on the results of the simulation, climatic parameters played a major role affecting WY compared to changes in LULC in the Citarum RBU. This model also shows that the effect of changes in rainfall (14.06–27.53%) is more dominant followed by the effect of evapotranspiration (10.97–23.86%) and LULC (10.29–12.96%). The InVEST model is very effective and robust for estimating WY in Citarum RBU, which was indicated by high coefficient of determination (R2) 0.9942 and the RSME value of 0.70.

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