A PISA-based Student Worksheet for Better Understanding of Mathematical Concept Sutama 1 , Harun Joko Prayitno 2 , Sofyan Anif 3 , Nuqthy Faiziyah 4 , Meggy Novitasari 5 , Muhammad Wildan Fadhilah 6 sutama@ums.ac.id 1 , harun.prayitno 2 , sofyan.anif@ums.ac.id 3 , nuqthy.faiziyah@ums.ac.id 4 , a410130043@student.ums.ac.id 5 , a410150171@student.ums.ac.id 6 Universitas Muhammadiyah Surakarta 1,2,3,4,5,6 Surakarta, Indonesia Abstract. A student worksheet is one of the teaching materials to improve student understanding in the classroom. However, many teachers could not effectively arrange and utilize it so that the learning objectives stated might not be reached. This study aims to generate a PISA-based student worksheet on valid and practical content and expose the effect on the ability to understand students' mathematical concepts. Using development research of a preliminary research, development phase, and assessment, the worksheet is composed. Besides, a test is used to determine the effectiveness of worksheets and another test is also to find out the effect of worksheets that have been made on the ability to understand mathematical concepts. As a result, this study has produced a valid and practical PISA-based student worksheet. The thing that is distinctive of this worksheet is that the question contains Sharing Task and Jumping Task. The result also shows that the worksheet could improve student understanding of a mathematical concept. Keywords: mathematical concept, PISA, student worksheet, sharing task, jumping task. 1 Introduction Understanding concepts is one of the mathematical skills or skills that is expected to be achieved in learning mathematics that is by showing understanding mathematical concepts learned, explaining the interrelationships between concepts and apply concepts or algorithms in a flexible, accurate, efficient and precise manner solution to a problem. Mathematical understanding will be meaningful if learning mathematics is directed at developing the ability of inter mathematical connections ideas, understanding how mathematical ideas are related to one another so that a comprehensive understanding is built up, and deep mathematics is used context outside of mathematics. The use of student worksheets is expected to be able to change the conditions of learning from what the teacher usually has to determine "what is learned" to "how to provide and enrich student learning experiences". Student learning experiences can be obtained through a series of activities to explore the environment through active interaction with friends, the environment, and other resource persons. Presentation of mathematics learning by using worksheet demands active participation from students because student worksheets is a form of teacher's effort to guide students in a structured manner, through activities that can provide an attraction to students to study mathematics. Through learning with the worksheet, the effectiveness of the Profunedu 2019, August 07, Surakarta, Indonesia Copyright © 2019 EAI DOI 10.4108/eai.7-8-2019.2288432