Development of Learning Devices Based on Guided Discovery to Improve Students’ Mathematical Reasoning Ability and Self-Esteem

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.