M.I.P. Sari, E. Musdi
The research that has been overshadowed in which teaching materials used by students are not all of the material in accordance with the KD. So that the material presented elusive student and as a result students awaiting an explanation by the teacher. Therefore, to create students who are active in learning, students can build their own thoughts or develop his own knowledge is to improve students' reasoning skills learning concept. To improve reasoning skills students need learning tools that make the students can learn and be independent in constructing ideas. And with the development of mathematical learning prangkat based constructivist approach, students can become more active, independent and able to build the knowledge gained. © 2020 Published under licence by IOP Publishing Ltd.
Mathematics Department, Universitas Negeri Padang, Padang, Indonesia
