Validity and reliability testing is very important for an instrument, both of which can determine whether the instrument used is good or not. This study intends to break down the correlation of the the mathematical resilience questionnaire for for studies utilizing SPSS and the Rasch Model. The research method used is a quantitative survey method, with a total of 207 students in one of the senior high schools in Jakarta. This study uses a mathematical resilience questionnaire which was adopted from other studies in which there are 4 indicators in the questionnaire. Testing the validity of the mathematical resilience questionnaire using the Rasch Model with the WinSteps 3.73 application showed that there were three invalid items (I9, I16, I18), and six items (I7, I11, I12, I13, I17, I19) which only met 1 condition. , so 26 must be retained because the item is satisfied. While the validity test on SPSS 24.0 which is seen from the Pearson correlation value, the results show that 6 items are invalid, namely (I7, I8, I9, I11, I16, I18), so the rest of the other items must be maintained because they meet the criteria. Meanwhile, the reliability calculation is (α = 0.84). The use of two different applications, namely Winsteps and SPSS, stated that the mathematical resilience questionnaire was declared valid and reliable. This is obtained by eliminating 8 statement items in the questionnaire.

Flipped Classroom Learning: Mathematical Creative Thinking Skills Based on Mathematical Resilience using Augmented Reality. Objectives: This study aims to determine the effect of the augmented reality (AR)-based flipped classroom learning (FCL) model on mathematical creative thinking skills (MCTS) in terms of mathematical resilience (MR). Methods: This research is a quasi-experimental quantitative research. The population of this study were students of SMAN 105 Jakarta with the research sample being the experimental class students and the control class selected purposively. Data analysis in this study used the Mann Whitney U Test, Cohen's d Effect Size Test and Spearman Correlation to determine the difference. Findings: Subjects on experimental group have mathematical creative thinking skills that are superior to subjects with conventional mathematics learning. Conclusion: The AR-based FCL model has a significant effect on the MCTS owned by subjects. In addition, KBKM has a significant relationship with MR.

This study aims to study the relationship between mathematics and culture in Indonesia, one of which is the traditional game of Nasi Goreng Kecap and Mejikuhibiniu. This research is considered important because it teaches students to see real-world activities clearly by being integrated into mathematical ideas. This research uses an ethnographic approach and a library study (literature study) which is a type of qualitative research. The result of this research is that the traditional game Nasi Goreng Kecap and Mejikuhibiniu contains the concept of number patterns, which can be developed in a learning design for number pattern material so that it can change the student's paradigm that mathematics is still considered abstract science to be more fun mathematics