R.H. Zarista, A. Asmar, Y. Yerizon
The research problem in is the students' mathematical reasoning ability is low, it is caused by learning device designed by the teacher does not yet support how to construct student's mathematical reasoning ability. Through the development of this learning instrument, it is expected that students' abilities in mathematical reasoning can increase. Learning tools are developed in the form of Lesson Plan and Student's Worksheets. We use research Plomp's model: Initial research, prototype phase, and assessment phase. The results of preliminary analysis research, mathematical reasoning ability and student learning outcomes are still low. Teachers and students need learning tools based on Learning Cycle 5E with simple language and guide students to understand mathematics well. This study produced a valid mathematics learning device. © 2020 Published under licence by IOP Publishing Ltd.
Mathematics Department, Universitas Negeri Padang, Padang, Indonesia
