Abstract
The objectives of this study are to describe: 1) validity of learning tools developed based on the Realistic Mathematics Education approach; 2) practicality of learning tools developed based on the Realistic Mathematics Education approach; 3) the effectiveness of learning tools developed based on the Realistic Mathematics Education approach; 4) improvement of students' mathematical problem solving skills using learning tools based on the Realistic Mathematics Education approach that has been developed. This research is a development research. The development model used to develop learning tools in this study is the Dick and Carey development model. Before the field trial was conducted, the learning tools were validated by three experts and two practitioners. From the results of the validation, it was found that: (1) the learning tools developed were valid with the total average validity of student books (4.33), teacher books (4.28), learning implementation plans (4.42), and student worksheets (4.44). Subjects in this study were seventh grade students of senior high school (SMP) 1 Medan which consisted of two classes, namely VII-Herodotus as a trial class I and VII-Pythagoras as a trial class II. (2) learning tools that had been developed are effective, seen from classical learning completeness are fulfilled, in which ≥ 85% of students were passed, student activities within the specified tolerance limits, and students' responses to learning are in good categories; (3) the average increase in students' mathematical problem solving ability from trial I to trial II was 0.18 points, namely from 3.02 in the first trial to 3.20 in the second trial, with an increase in classical mastery learning 14%.
Highlights
An advanced nation is a nation that has quality of human resources (HR), both in terms of spiritual, intelligence and skills
The importance of mathematical problem solving abilities possessed by students: (1) the ability to complete is a general goal of teaching mathematics, even as the core of mathematics; (2) problem solving includes methods, procedures and strategies are the core and main processes in the mathematics curriculum; and (3) the completion of mathematics is a basic ability in learning mathematics. [10] reveals the advantages of problem solving abilities, namely when solving problems, students learn to apply their mathematical skills in new ways, develop a more understanding of mathematical ideas and get a sense of experience "Being a mathematician"
The results of this study were strengthened by Adek [18] on his study entitled Impact of Indonesian Realistic Mathematics Approach to Students Mathematic Disposition on Chapter Two Composition Function and Invers Fungtion in Grade XI IA-1 SMA Negeri 4 Padangsidimpuan. stated that Students are more active in the learning process by using Realistic Mathematics Education (RME) than without using RME Mathematic disposition in class XI IA SMA Negeri 4 Padangsidimpuan.increase after using RME
Summary
An advanced nation is a nation that has quality of human resources (HR), both in terms of spiritual, intelligence and skills. The quality of good education will affect good learning in schools especially learning mathematics. Observing the importance of the role of mathematics in human life, it is natural that students in schools are required to understand mathematics, and are proficient in various mathematical representations and problem solving. Mathematics is an important subject to be taught at every level of education because it provides many benefits including helping to prepare for a career in the future, building problem solving skills, forming character, helping to learn other knowledge, forming a logical mindset, advancing ways of thinking so that students can have the ability to obtain, manage, and utilize information to survive in a state that is always changing, uncertain, and competitive [1]
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