Abstract
This study generally aims to produce learning devices based on the guided discovery that can improve students’ mathematical reasoning ability and self-esteem. Specifically, this study aims to: 1) analyze the validity of learning devices developed based on guided discovery, 2) analyze the practicality of learning devices developed based on guided discovery, 3) analyze the effectiveness of learning devices developed based on guided discovery, 4) analyze the increase in students' mathematical reasoning ability who learn with learning devices developed based on guided discovery, and 5) analyze the increase in students' self-esteem who learn with learning devices developed based on guided discovery. The type of research is development research using a 4-D Model. The results showed that: (1) learning devices developed based on guided discovery met valid criteria based on expert judgment; (2) learning devices developed based on guided discovery met practical criteria, in terms of a) expert judgment and b) the results of observations of the learning device implementation; (3) learning devices developed based on guided discovery met effective criteria, in terms of a) the student learning completeness classically has been achieved in the trial II by 91,43% and the disseminated stage by 94,29%, b) the achievement of learning purpose has been achieved for each item, c) the learning time used does not exceed or equals the normal learning time, and d) the student responses positive to learning devices; (4) the students' mathematical reasoning ability increased with an average of N-Gain by 0,53 in the medium category; and (5) the students' self-esteem increased with an average N-Gain by 0,49 in the medium category. Keywords: development of learning devices, 4-D model, guided discovery-based learning, mathematical reasoning ability, self-esteem DOI : 10.7176/JEP/11-3-12 Publication date: January 31 st 2020
Highlights
Education is one of the factors of change because humans can make various changes in every area of life through the education they have enjoyed
While the research instruments validated by experts are test items mathematical reasoning abilities are in the valid category and are quite valid and self-esteem questionnaire statements are in the valid category
While the research instruments validated by experts are test items mathematical reasoning abilities are in the valid category and are quite valid, as well as self-esteem questionnaire statements are in the valid category
Summary
Education is one of the factors of change because humans can make various changes in every area of life through the education they have enjoyed. With the ability to reason someone can make various changes. Apart from being a factor of change, education is closely related to the progress of science and technology. One of the lessons that support the advancement of science and technology in mathematics. With its huge role in the world of education and the progress of science and technology in the future, mathematics learning must take place effectively. Teachers as educators are expected to have the ability to design and manage teaching and learning activities that can attract students to actively participate in it with the aim of improving students' mathematical reasoning abilities
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