R. Yuwandra, I.M. Arnawa
The goals of this study is to produce the learning tools of mathematics with a valid, practical and effective CTL approach. The developed learning tool consist of a lesson plan and a student worksheet. The development model used in this study is the Plomp model (preliminary research, prototyping phase, and assessment phase). The device created is used to improve understanding of concepts and mathematical problem solving for elementary school students. The instruments used were validation sheets, teacher, and student response questionnaires and mathematics learning achievement tests. Learning devices are said to be valid if they meet the content and construct validity. Practicality seen from the ease of use of the device. The effectiveness of the device seen from the percentage of students' completeness of the test at least 70%. The results of the experts' validation show that the learning device meets the valid criteria. Practicality reaches very practical criteria based on the questionnaire responses of teachers and students. The percentage of students' completeness tests is 75%. © 2020 Published under licence by IOP Publishing Ltd.
Mathematics Department, Universitas Negeri Padang, Padang, Indonesia; Mathematics Department, Universitas Andalas, Padang, Indonesia
