Development of Learning Devices to Improve Student's Mathematic and Self-Efficacy Communication Abilities Through the Problem Based Learning Model Assisted by the Video Media Learning in 10th Grade Senior High School

This study aims to: 1) analyze the validity of learning devices using the Problem Based Learning model developed to improve students 'mathematical communication abilities and students' self-efficacy; 2) to analyze the practicality of learning devices based on the Problem Based Learning model developed to increase students 'mathematical communication abilities and students' self-efficacy; 3) analyzing the effectiveness of the learning devices using the Problem Based Learning learning model which was developed to improve students 'mathematical communication abilities and students' self-efficacy; 4) knowing the importance of learning media assistance in the form of Learning Videos to achieve learning objectives. This study used a modified Dick & Carey development model from Dick & Carey and was implemented in 10th grade Senior High School 18 Medan for the 2020/2021 school year. The results showed that: 1) The validation of the learning devices was developed with the total mean value of the whole being at a value of 4 ≤ Va <5 so that the experts stated that the learning device was in the "valid" category; 2) Problem Based Learning learning devices that have been developed have met the "practical" category; 3) The developed learning devices oriented to the problem-based learning model meet the criteria of being effective; 4) There is a significant increase between the average mathematical communication abilities and the average N-gain in the first trial of 0.25 which is in the low category, increasing in the second trial of 0.37 which is in the medium and Self- Efficacy of students who are given learning devices based on Problem Based Learning. Keywords: development of learning devices, mathematical communication abilities, self-efficacy, problem based learning, video media learning DOI: 10.7176/JEP/12-10-07 Publication date: April 30th 202