7 International Journal of Progressive Sciences and Technologies (IJPSAT) ISSN: 2509-0119. © 2019 International Journals of Sciences and High Technologies http://ijpsat.ijsht-journals.org Vol. 13 No. 1 February 2019, pp. 67-73 Corresponding Author: Yefi Yuni Sisriwati 67 The Validity of Learning Devices with Creative Problem Solving Models to Improve Mathematical Problem-Solving Ability Yefi Yuni Sisriwati 1 , Hendra Syarifuddin 2 1 Student of Postgraduate Program of Faculty Mathematics and Natural Sciences, Padang State University, Padang-West Sumatera, Indonesia 2 Lecturer of Postgraduate Program of Faculty Mathematics and Natural Sciences, Padang State University, Padang-West Sumatera, Indonesia Abstract - This validity aims to find out the validity of mathematical learning devices based on creative problem solving models to improve students' mathematical problem solving abilities. Product learning is said to be valid if valid from the content and construct. Content validity is the suitability of the product developed with the specified curriculum. Validated learning tools, namely the Learning Implementation Plan (RPP)and Student Worksheet (LKPD) class X SMA, while construct validity is the suitability of the product developed with the theories that become the foundation of product development. This learning tool is validated by 3 Mathematics Experts, 1Indonesian Language Expert and 1 Educational Technology Expert. Validity is obtained from the results of validation by experts using an instrument in the form of questionnaire. The validation results of the experts indicate that the learning device meets valid criteria. Keywords - Learning Device Validity, Creative Problem Solving Model, and Problem Solving Ability. I. INTRODUCTION Problem solving ability is very important for students. Because the ability to solve problems can make students motivated to make the best decisions if they face problems in their daily lives. The problem solving ability is the process that is taken by someone to solve the problem at hand until the problem is no longer a problem for him [1]. Therefore, the ability of students to solve mathematical problems needs to be continuously trained and developed in each student. Research conducted by Sari (2017) shows that the average mathematics problem solving ability of high school students is still low[10]. The research conducted by Sumanah (2014) showed that the problem-solving abilities of students in class XI IPA acceleration programs were still low, resulting in student learning outcomes being low[11]. The problems found by previous researchers also met when conducting a preliminary study in July 2018 at 2 Painan Public High School that the learning outcomes of mathematics and tests of students' problem solving ability were still many under the Minimum Limitations Criteria (KKM), which was 78. Based on the description of the problem above, we need a learning tool that can help math teachers and students in the learning process in the classroom. The implementation of learning that is not optimal is inseparable from learning resources developed so that students are motivated in learning mathematics. One of the innovations in the learning process of mathematics needed by students is the existence of learning resources. The learning resources used are