N. Noperta, A. Armiati, D. Permana, Y. Yerizon
The validity of learning materials made by the teachers is untested, so it is not valid yet to use in supporting the improvement of students' mathematical communication skills. This research is a part of RME based research on Mathematics learning materials development to improve mathematical communication skills for Grade X SMK students on construction and property engineering programme. This research is aimed to assess validities of learning materials through two phases. First, self-evaluation was conducted by involving a peer. The results showed that Mathematics learning materials could be extended to the expert review phase with minor revision. Second, expert review, the researcher asked five experts to assess its validity. Thus, the results show Mathematics learning materials have been valid. © 2020 Published under licence by IOP Publishing Ltd.
Mathematics Department, Universitas Negeri Padang, Padang, Indonesia
