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Learning tools based on an open-ended approach with virtual manipulative applications were developed to improve students creative thinking skill. The purpose of this study is to determine the quality of learning tools and the increase in students creative thinking abilities. This study is a development research using the Dick and Carey development model, which is carried out in ten stages. Learning tools produced from this study are Student Books (SB) and Student Worksheets (LKPD). Based on the data analysis, learning tools had met the criteria of being valid, practical, and effective in terms of their respective criteria and increasing students creative thinking skills using learning tools through an Open-ended approach assisted by virtual manipulative applications on quadrilateral material is 4 students (12.5%) experiencing an increase in creative thinking skills with the High category, 17 students (53.13%) experienced an increase in creative thinking skills with the category Medium and 11 students (34.38%) experienced an increase in creative thinking skills with the Low category.

Developing Learning Devices Based on the Open-Ended Approach to Improve Student’s Creative Thinking Abilities