The purpose of this study was to improve the understanding of mathematical concepts of students through Realistic Mathematics Education. Learning model assisted by teaching aids on cube and block material. This research is classroom action research. The research subjects were class VIIIA students for the 2021/2022 academic year with 26 people. The techniques used in data collection are observation and tests. The data analysis technique in this study is data analysis of teacher observations, student observations and tests of understanding mathematical concepts. The research procedure includes planning, implementation, observation, and reflection. The study consisted of 2 cycles. Realistic Mathematics Education learning assisted by teaching aids on cube and block material, as long as this research has been running according to the learning implementation plan, has succeeded in creating a conducive learning situation, and increasing students' understanding of concepts. The results showed that the ability to understand mathematical concepts in the first cycle was 50% less criteria, and in the second cycle, 81% good criteria. The results of observations of teachers' teaching skills when managing learning has increased. In the first cycle, it reached 69.12% good criteria, while the second cycle reached 85.28% excellent criteria. The results of observations of student learning activities have increased. From the first cycle, the percentage is 63.75 good criteria, while the second cycle is 83.75% excellent criteria.

The purpose of this study was to describe how digital natives as preservice mathematics teachers learn mathematics. The research subjects were 30 students of the Mathematics Education Study Program at the Universitas Negeri Gorontalo. This research is a descriptive qualitative research with data collection techniques are semistructured interview, questionnaire using Mentimeter, and documentation. Data collecting held in 2022. First, they were interviewed to obtain information on how they studied college mathematics courses such as calculus or differential equations. After obtaining the methods they used, they were then asked to fill out a questionnaire via Mentimeter. From the results of the interviews and filling out the questionare, it was found that their ways of learning were by watching YouTube, reading books, discussing mathematics material with their peers, searching for learning material from the internet, and also using mathematical applications to help them solving problems. Although everyone has different preferences for which method they like the most, in general, they combine all five learning styles. When they were asked to choose the method they liked the most, 50% of them choose watching YouTube; 43% prefer to learn from books; and 6.67% choose to use mathematical application. The mathematical applications they use are dominated by Photomath. Other applications used are Qanda, Brainly, Colearn, Mathway, MathLab, Mathenchanter, Geogebra, Snap Quiz, and Wolfram Alpha. The results show that book is still relevan to use in this digital age.