N. Erawati, D. Permana
The issue of students' difficulties in Mathematical problem solving should be resolved. One of the ways to overcome that problem is developing an appropriate learning tools. This case is expected to increase students' ability in solving Mathematical problem. The type of this research was development research and used plom model in it. This research was consisted of three stages. They were prelimenary, development, and evaluation analysis. The result of this research was practical and effecctive Mathematics learning device. The analysis validation of lesson plan and students' worksheet stated that they were valid. Besides, learning device was practical based on the result of analysis. The result was proven at interview guidelines, teacher's response questionnaire, students' response questionnaire and observation sheet in implementation of learning. The result of average percentage of practical score, teacher's response got 88.99 %. Meanwhile, students' response was 85.12 %. The result of practicality of learning device was strongly practical categories. Besides, learning device was effective to increase the ability of students in solving problem, especially at grade one of senior high school in Indonesia. Learning device that was developed had effective criteria. The result of students' competency who are able to solve the Mathematic problem was 63.63 %. Theirscore were above Minimum Criteria of Mastery Learning. © 2020 Published under licence by IOP Publishing Ltd.
Mathematics Department, Universitas Negeri Padang, Padang, Indonesia
