Abstract
The research conducted is a development research that adapts to the model by Plomp development model(2010) which consists of3 phases, they are the preliminary research phase, the prototyping phase, and theassessment phase. The purpose of this study is to find out how the process of developing learning devicesand how the results of the development of mathematics learning tools in junior high school level that applyguided discovery models for circle that meets valid, practical, and effective criteria. In this study, researcheruses several instruments such us Learning Implementation Plans, Student Worksheets, and AssessmentSheets; observation instrument sheet of the implementation of learning; students’ questionnaire responseinstruments and the instrument of validation sheet. The results of this study is junior high schoolmathematics’s learning tools on the circle material using the guided discovery model. This learning toolhas been validated by experts and received positive responses from both teachers and students whenapplied in class. So, the mathematics learning device withguided discovery models on this circle materialhas fulfilled valid, practical, and effective criteria.
Highlights
PRELIMINARY Mathematics is one of the subjects that have been taught from kindergarten to university and has an important role for the advancement of science and technology
Because of the difficulties when working on a mathematical problem in which there is a stabilization of concepts or contextual problems that vary hard to be understand toward high social activity of students
This research is a form of research development because in this study will be developed a mathematical learning tool consisting of Learning Implementation Plan (RPP), Students’ Worksheet (LKPD), and Assessment Sheet (LP)
Summary
PRELIMINARY Mathematics is one of the subjects that have been taught from kindergarten to university and has an important role for the advancement of science and technology. According to Rohman & Karimah (2018) educators realize that learning methods that are often used in class use the lecture method or by assignment, this is one of the factors that causes the learning outcomes of students to tend to be low, so learning activities in the classroom are less attractive to students This happens because during learning, the material is delivered in an unpleasant way. As educators or teachers in the modern era, to be careful in preparing a variety of learning strategies that will be applied in the classroom designed to be fun is a must This is very closely related to the preparation of mathematics learning tools. The conditions when students are unable to solve a problem, basically they only hold fast to one way of solving and lack of understanding of the concept, it causes the learning outcomes are not optimal
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