Character education plays a critical role in all aspects of life and thus, it has been widely-adopted in schools. An indication of its success can be reflected in the student learning achievement. The purpose of the study was to determine the effect size of the relationship between character education values and mathematics learning achievement, with a meta-analysis study. In this research, character education value is the independent variable while mathematics learning achievement is the dependent one. The data were obtained from the results of online database search at Google Scholar from 2012-2019. Based on the search, 16 research publications met the criteria determined based on rigorous screening. The data were analyzed using a quantitative meta-analysis approach, specifically correlation meta-analysis. The results show that there was a significant relationship between character education values and students’ mathematics learning achievement. The effect size value was in the moderate effect category. The findings are in line with those of previous studies investigating this relationship and thus, strengthen the theory about the factors that influence mathematics learning achievement. In addition, these findings suggest five-character education values that teachers can provide to improve students’ mathematics learning achievement.

This study aims to examine the effect of interactive multimedia on students' mathematical reasoning abilities on prismatic material. This research is a quasi-experimental study with a post-test-only control group design. Students in one of the junior high schools in Gorontalo were the samples in this study, where class VIII-2 was the experimental class, and class VIII-1 was the control class. The experimental class was a class that was given learning treatment using interactive multimedia, and the control class was a class that was given learning treatment using PowerPoint. Data on students' mathematical reasoning abilities were collected by giving tests of mathematical reasoning abilities using questions in the form of descriptions. The data collected was then analyzed descriptively and inferentially. The results of the descriptive analysis obtained are the average mathematical reasoning ability of students in the experimental class is higher than the control class. These results are supported by the inferential analysis, which reveals that interactive multimedia has more effect on students' mathematical reasoning abilities than PowerPoint.

Background: The need for skincare is increasing. One of the indicators of skin health is the brightness of the skin tone. Tyrosinase enzymes can darken the skin color due to their activity against melanin biosynthesis. The skin color will also change when exposed to UV rays, and even at a more severe level, it can cause cancer. Aims: The purpose of this study was to determine the inhibitory activity of the tyrosinase enzyme and the SPF (Sun Protection Factor) value of ethanol extract, water fraction, and n-butanol fraction from Chromolaena odorata L. leaves. Methods: In this study, tests were carried out on ethanol extract, water fraction, and an n-butanol fraction of C. odorata leaves to inhibit tyrosinase enzyme activity based on percent inhibition and determination of inhibitory activity against UV light based on the SPF value. Determination of tyrosinase enzyme inhibitory activity using an ELISA reader was carried out by calculating the IC50 value with kojic acid as a positive control and measuring the SPF value using UV-Vis spectrophotometry. Result: The results showed that the IC50 value of the tyrosinase enzyme inhibitory activity test, kojic acid as a positive control was 24.85 µg/mL (very strong), ethanol extract samples, water fraction, and n-butanol fraction were 191 µg/mL (weak), 65.86 µg/mL (very strong), and 14.59 µg/mL (very strong), respectively. The SPF value, including minimal protection shown by the ethanol extract at a concentration of 60 µg/mL, the water fraction at a 120 µg/mL concentration, and the n-butanol fraction a concentration of 40 µg/mL. Conclusion: The ethanol extract, water fraction, and n-butanol fraction of the Chromolaena odorata L. had an inhibitory effect on the tyrosinase enzyme and sun protection capacity used as an ingredient in cosmetic preparations

BACKGROUND: Antioxidants are substances that can inhibit the oxidation process, so that they have a protective effect on cells from the dangers of free radicals. One of the plants that has activity as natural antioxidants is Botto-Botto leaves (Chromolaena odorata L.). AIM: This study aims to determine the antioxidant activity of the Botto-Botto leaf fraction using the DPPH and ABTS methods. METHODS: The leaves of Botto-Botto (Chromolaena odorata L.) obtained from Takalar District, South Sulawesi are sorted, dried and pollinated. The powder was immersed in 70% ethanol solvent and sonicated. Furthermore, the extraction was carried out by maceration method with 70% ethanol solvent and fractionated using water, n-hexane, and n-butanol as solvents and dried. The fractionation results were continued for antioxidant testing using the DPPH and ABTS methods. RESULTS: The n-butanol fraction of Botto-Botto leaves had the highest antioxidant activity, namely the strong active category. In the DPPH and ABTS methods, the n-butanol fraction has IC50 values of 33.535 μg / mL and 60.885 μg / mL, respectively. CONCLUSION: The DPPH and ABTS methods, the n-butanol fraction of botto-botto leaves have strong antioxidant activity compared to other fractions, namely the water fraction and the n-hexane fraction.

Jenis penelitian ini adalah penelitian eksperimen semu (quasi experiment) yang bertujuan untuk mengetahui pengaruh metode inside-outside circle terhadap kemampuan berpikir kritis matematis siswa kelas XI SMA Hang Tuah Makassar. Populasi dalam penelitian ini adalah siswa kelas XI SMA Hang Tuah Makassar, dengan pengambilan sampel secara random. Sampel dalam penelitian ini adalah siswa kelas XI MIPA 1 yang berjumlah 29 orang sebagai kelas eksperimen dan kelas XI MIPA 2 yang berjumlah 26 orang sebagai kelas kontrol. Instrumen yang digunakan adalah tes kemampuan berpikir kritis yakni post-test berupa 5 soal esai yang telah divalidasi oleh ahli. Data dianalisis secara deskriptif dan inferensial dengan uji normalitas dan uji homogenitas sebagai uji prasyarat analisis dan uji t sampel independen sebagai uji hipotesis. Hasil analisis berdasarkan uji t sampel independen, diperoleh nilai 0,005 < ½α (0,005 < 0,025) dengan nilai thitung > ttabel yaitu (2,909 > 1,674) yang menunjukkan adanya perbedaan dari kemampuan berpikir kritis matematis siswa kelas kontrol dan kelas eksperimen, sehingga dapat disimpulkan bahwa terdapat pengaruh penerapan metode inside-outside circle terhadap kemampuan berpikir kritis matematis siswa kelas XI SMA Hang Tuah Makassar.