Covid-19 Pandemic has changed all sectors, one of which is the system in education. Teachers and students are required to learn from home through online learning, it affects the mathematical resilience of students. This research is motivated by the number of findings of decreased student resilience in learning mathematics. The purpose of this study is to examine: (1) Steps of online learning by teachers (2) Mathematical resilience of students during online learning (3) students responses for online learning. The method in this research is descriptive qualitative, the sample selected as many as 4 teachers and 6 students with high, medium and low abilities in one junior high school in Cimahi. Data collection techniques used questionnaires for students to study students ‘mathematical resilience during online learning, interviews to examine students’ responses to online learning, and interviews and observations with teachers to analyze the steps of online learning that were carried out. The results of the study show: 1) The online learning process begins with handouts through Google Classroom, followed by an explanation of the material using a zoom meeting and assignments through the Google Classroom (2) Student resilience of mathematics is high during online learning. (3) students give positive responses for online learning.

The previous research showed that slow sand filtration (SSF) can remove the total coli by approximately 99% because of the schmutzecke layer in the filter. The presented study aimed to complete the previous research on SSF, especially on the schmuztdecke layer mechanism, to remove total coli. Total coli is a parameter of water quality standard in Indonesia, and the behavior of schmutzdecke affects the total coli removal. In the present study, the raw water from Amprong River was treated using horizontal roughing filter (HRF) and SSF. The variations in SSF rate used were 0.2 and 0.4 m/h. Total coliforms were analyzed using the most probable number test, and schmutzdecke visualization was conducted through scanning electron microscopy-energy-dispersive X-ray spectroscopy (SEM-EDX). The best coliform concentration in water treated by the combination of HRF and SSF was 4,386 colonies per 100 mL of sample using the filtration rate of 0.2 m/h, and its removal efficiency was 99.60%. However, the quality of water treated by the combination of HRF and SSF did not meet the drinking water quality standard because the removal of total coli must be 100%. The SEM-EDX visualization results in schmutzdecke showed that the average bacteria in the schmutzdecke layer were small, white, opaque, and circular, with entire edge and flat elevation. The Gram test results showed that the schmutzdecke bacteria consisted of Gram-positive and Gram-negative bacteria with basil as the common cell form.

Abstrak. Pembelajaran secara daring merupakan salah satu cara mengajar yang efektif saat kondisi pandemi seperti saat ini, namun tentunya pembelajaran harus dikemas dengan baik, salah satunya seperti pada penelitian ini. Penelitian ini bertujuan untuk mengembangkan bahan ajar menggunakan live worksheet berbasis realistic mathematics education (RME) berbantuan geogebra yang validitasnya baik dan juga praktis, kemudian menelaah pencapaian kemampuan abstraksi dengan menggunakan bahan ajar tersebut. Metode penelitian yang digunakan adalah pengembangan, dengan subjek yaitu siswa SMP. Instrumen yang digunakan yaitu lembar validasi, lembar observasi dan soal tes abstraksi. Teknik pengolahan data yang digunakan adalah dengan mengolah data menggunakan rumus validasi dan praktikalisasi dan menggunakan uji t satu pihak. Hasil penelitian yang diperoleh yaitu 1) bahan ajar sangat valid, dengan rata-rata penilaian validator sebesar 85% (bahan ajar sudah dapat digunakan), terlebih dalam pembelajaran daring seperti saat ini; 2) bahan ajar sangat praktis untuk digunakan, dengan rata-rata penilaian yang diberikan oleh siswa sebesar 82%; 3) pencapaian kemampuan abstraksi siswa kelas yang menggunakan pembelajaran dengan bahan ajar live worksheet berbasis RME berbantuan geogebra lebih baik dari pada yang menggunakan pembelajaran saintifik. Rekomendasi yang dapat diberikan adalah penggunaan live worksheet berbasis RME berbantuan geogebra menunjukkan hasil yang signifikan terhadap pembelajaran dan kemampuan abstraksi siswa.

The purpose of this research is to analyze the level of abstraction mathematical ability of the students through learning using Realistic Mathematics Education (RME) with Visual Basic Application (VBA) for Microsoft Excel. This research uses a descriptive qualitative method and the subject of this study is junior high school students of grade 9th in one school in Ngamprah as many as 35 students. One of the instruments in this study is the abstraction test. Results show that as many as 65.71% of students are in the first level of Perceptual Abstraction. As many as 57.14% of students are in the second level of Internalization.  As many as 31.43% of students are in the third level of Interiorization, and as many as 17.14% of students are at the last level, namely Second Level of Interiorization. Overall, the sample in this study can be categorized into four levels of abstraction.

Tujuan dalam penelitian ini adalah untuk menelaah bagaimana hubungan antara kemampuan pemecahan masalah matematis dengan self confidence siswa dalam pembelajaran yang menggunakan pendekatan Pendidikan Matematika Realistik (PMR).Metode dalam penelitian ini adalah metode Kuasi Eksperimen, dengan diambil dua kelas yang berbeda, dimana kelas pertama mendapatkan pembelajaran dengan PMR dan kelas kedua menggunakan pembelajaran biasa. Populasinya merupakan seluruh siswa pada salah satu SMP di Bandung Barat, dengan sampel diambil dua kelas. Kedua kelas diberikan pretes dan angket awal untuk mengetahui kemampuan awal mereka, selanjutnya pada kelas eksperimen diberikan pembelajaran dengan pendekatan PMR dan kelas kontrol diberikan pembelajaran basa, dan di akhir kedua kelas diberikan postes dan juga angket akhir, yang mana data di akhir tersebut akan di olah dan di analisis korelasinya menggunakan Product Moment Pearson. Hasil penelitian menunjukkan adanya hubungan yang signifikan kemampuan pemecahan masalah matematis dan self confidence siswa dalam pembelajaran matematika.

Penelitian ini bertjuan untuk menelaah bagaimana hubungan antara kemampuan berpikir kreatifmatematis dengan motivasi belajar siswa dalam pembelajaran yang menggunakan pendekatanCreative Problem Solving (CPS). Metode penelitian yang digunakan adalah metode kuasieksperimen, dengan cara mengambil dua kelas yang berbeda, kemudian kelas pertamamendapatkan pembelajaran dengan CPS dan kelas kedua menggunakan pembelajaran biasa.Populasinya adalah seluruh siswa SMP di Kota Cimahi, dengan sampel diambil dua kelas. Keduakelas diberi pretes agar mengetahui kemampuan awal mereka, selanjutnya kelas eksperimendiberi pembelajaran dengan CPS dan kelas kontrol diberi pembeljaran biasa, dan terakhir keduakelas diberikan postes dan angket motivasi belajar yang mana data tersebut akan diolah dandianalisis korelasinya menggunakan Product Moment Person. Hasil penelitian menunjukan adanyahubungan yang signifikan antara kemampuan berpikir kretif matematis dan motivasi belajar siswadalam pembelajaran matematika

This study aims to examine the development of an interactive learning model using Visual Basic Application for Microsoft excel with ethnomathematical content on fractions, to improve primary school students’ mathematical reasoning abilities. The research method used is development through the stages of conducting preliminary studies and literature, designing interactive learning models, conducting FGDs, producing initial designs of interactive learning models, conducting limited trials in one primary school, making revisions, conducting extensive trials in four primary schools, producing trial in another primary school. The last obtaining a final model and conducting socialisation. The last, it provides a test of mathematical reasoning ability. The research subjects were teachers and students in six primary schools. The research instruments were interviews, validation sheets, documentation, learning observation sheets, questionnaires and mathematical reasoning ability test.  The assessment criteria for the developed learning model include syntax, social system, principle of reaction, supports system and instructional impact. The results showed that 1) Development of VBA-assisted and ethnomatematically-loaded interactive learning models go through two major stages, namely product development and validation  2) The Interactive learning model was declared very valid; 3) The responses of teachers and students were generally positive; 4) The achievement of students’ mathematical reasoning abilities after gave learning with an interactive model using VBA for Microsoft Excel with ethnomathematical contents better than using ordinary learning.

In Malaysia rural area, the fixed-rate method is the waste charging approach adopted by the local authorities because of low administration cost, but it is ineffective and has caused many environmental issues. Therefore, this study was conducted to explore the public willingness to pay on better solid waste management services at rural area of Kelantan. A total of 911 respondents from three (3) districts (Jeli, Kuala Krai, Gua Musang) participated in this study. The results showed that most respondents (±75%) expressed their satisfaction on current solid waste management services provided. This study indicated that nearly 62% of respondents were willing to pay more for better solid waste management services. This study revealed that the estimated mean willingness to pay (WTP) for better solid waste management service is RM12.05 per household. Logistic regression model suggested that satisfaction on solid waste management services affected the WTP amount, apart from socio-economic factors such as educational level, type of houses, occupation and household income. The results can be useful for understanding the rural resident’s attitudes and WTP for solid waste management services.