This study aims to develop mathematics teaching materials based on a project- based learning model, that help improve students' Higher-Order Thinking Skill (HOTS) and character. This type of research is developmental research that adheres to the ADDIE development model, which includes analysis, design, development, implementation, and evaluation. The participants were 25 preservice teachers enrolled at the basic mathematics course in one of university in Aceh, Indonesia. The study results showed that the teaching materials that had been developed were appropriate to use in learning and the feasibility of content, design, and language met the valid criteria. Students' responses to the teaching materials were very good to support and accomplish lectures. The teaching materials tested were able to improve students' HOTS, based on the pre-test results with an average score of 67 and the post-test results with an average score of 88. Besides, the average score of student character increased by 20% in the good category and by 16.67% in the very good category. To sum up, the mathematics teaching materials based on the project-based learning model are considered valid, practical, and effective. © 2020 IOP Publishing Ltd. All rights reserved.
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