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This research study is research and development learning devices. This study aimed to describe how the validity, practically, and effectiveness of learning devices oriented of problem based learning which is developed and knowing about increase students’ combinatorial thinking in mathematical problem solving ability after using learning devices which is developed. The product that produce in this study is lesson plan, handbook’s teacher, student’s book, and worksheet. Learning devices development using 4D model which developed by Thiagarajan, Semmel and Semmel with four step, that is define, design, develop and disseminate. This study was conducted in two trials in two different class . Data was analyzed descriptive and result of research showed the devices was categorized valid both in terms of content and construct, practical to use, and effective and students’ combinatorial thinking in mathematical problem solving ability increased by using learning devices which developed. The increasing of students’ ability seen from the result of test in trial I and trial II were increase about 6,67%. Keywords–Learning Devices, Problem Based Learning, Combinatorial Thinking.

Development of Learning Devices Oriented Problem Based Learning to Increase Student's Combinatorial Thinking in Mathematical Problem Solving Ability