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The aims from this study observe at the effect of using the RME approach with the TANDUR design on students’ ability to understand concepts and solve problems in Mathematics in SMP Negeri 1 Pantai Cermin both to the students who had high previous knowledge and those who had low previous knowledge. This was a quasi-experimental research. Samples are choose using randomized sample. Data are analysed using t-test, Mann Whitney test and two Ways Anova using MINITAB software. The result of data analysis showed that: (1) the application of RME with TANDUR can improve students’ MPS skills and still need to improve their ability to understand concepts, (4) there was no interaction between learning approaches and previous knowledge toward the eighth grade students.

Research on teacher professionalism in the learning process experiences exponential growth. One form of teacher professionalism is how teachers can use media that can make learning interesting. Geogebra is an application that can be used by teachers in learning on certain material. This research was a survey research that sees teacher interest in the use of geogebra software. Sixteen teachers from 10 junior high schools in one sub-district in one of city at Indonesia were chosen as research subjects. The training was held for five hours. When the teacher training was videotaped, observed, and interviewed. Obtained 84.76% percent of teachers gave good attention and 73. 18 % give good participation to this training.

Based on the results of observation and experience of researchers as mathematics teachers in one of the vocational high schools in Indonesia, information are obtained that the average mathematics scores of students are still below the Minimum Mastery Criteria. This is caused by: the mind-set of students who think mathematics is not important compared to the subject of vocational specialization, the learning process is less engrossed and interesting because of the teacher’s monotonous teaching style. As a result, students’ interest in learning mathematics is low. To overcome this problem, the teacher must design a mathematics learning strategy in the form of a mathematics learning tool in the form of a learning implementation plan and a student worksheet based on Realistic Mathematics Education (RME). Because the RME-based learning approach starts from ‘real’ things for students. This type of research is development research with the Plump model consisting of the preliminary research phase, the prototype phase and the assessment phase. In this study researchers were only at the initial investigation stage, namely at the student analysis stage. The purpose of this study was to increase students’ interest in learning mathematics. The instrument collection for initial investigation data was observation sheets, questionnaires and interviews with data analysis techniques namely descriptive techniques. The results of the initial investigation of the analysis of learners found that the interest in learning mathematics in vocational secondary school students is very low.

This study aims to describe the errors of student in solving ordinary differential equation (ODE) problems based on SOLO taxonomy. In this case there are 5 kinds of errors, namely concept errors, using data, language interpretation, technical, and making conclusions. This descriptive study involved 10 ODE research subjects. The research results obtained are the subjects of research tends to make mistakes in the five SOLO taxonomy errors. The reason is because students are not skilled in using formulas, are not thorough, and the habit of not repeating lessons.