Development of Learning Tools with the Discovery Learning Model to Improve the Critical Thinking Ability of Mathematics

Abstract

This research was motivated by the still limited learning of mathematics as a means of supporting learning in the 2013Curriculum. The purpose of this study was to produce some products in the form of learning devices (syllabus, RPP andLKPD) on the material for the flat side building of VIII Middle School with discovery learning models that meet valid,   practical,   and   effective   criteria   for   improving students  mathematical  critical  thinking  skills.  Learning tools are developed using the 4-D model, which are define, design, develop and assess. The research instrument used was an instrument of validity in the form of a validation sheet  to  assess  the  feasibility  of  the  syllabus,  RPP  and LKPD as well as a practical instrument in the form of a teacher observation sheet activity in applying the discovery learning  model  and  student  questionnaire  responses  to assess  the  practicality  of  LKPD.  The  results  of  the validation of the experts stated that the product developed reached a valid category with an average rating of 76.67% for syllabus, 76.67% for RPP and 88.04% for LKPD. Learning devices are considered very practical in small group trials with an average response of 96.44% students and large group trials from the observation sheet of teacher activity  93.71%  and  the  average  response  of  students87.77%. The learning tools have been proved to improvestudents mathematical critical thinking skills in terms of an average N-gain of 0.53 in the medium category.