Abstract
Students' low ability in mathematical reasoning is influenced by the learning model applied in the classroom. Such as the use of learning tools with a context that is closer to students' life. The purpose of this research is to produce inquiry-based learning tools with a Malay Rengat context that is valid in improving students' mathematical reasoning abilities. This development research uses the Plomp model which consists of three phases, namely preliminary research, prototyping, and the assessment phase. The validation of the tools was carried out by three mathematics education experts, one educational technology expert, and one Indonesian language expert. The average scores obtained from the validation are 3.57 for the validity of the lesson plans and 3.55 for the validity of the worksheet. With these results it can be concluded that the development of inquiry-based mathematics learning tools with the Malay Rengat context is valid.
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