This study aims to produce learning tools based on the REACT model to improve students' valid communication skills. Learning tools developed in the form of Learning Implementation Plans (RPP) and Mathematics Student Worksheets (LKPD) in grade VIII SMP. The learning model is a REACT model consisting of Relating (associating), Experiencing (experiencing), Applying (applying), Cooperating (working together), and Transferring (transferring). The purpose of the REACT Model is to aim for students to

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... e actively involved physically and mentally and there are activities that can bring students to discover the principles themselves in the material being studied. This learning tool uses the Plomp development model which consists of 3 stages, namely the initial investigation phase (preliminary research), the development phase (development or prototyping phase) and the assessment phase (assessment phase). The learning device is said to be valid if it meets the content and construct validity. The instrument used is a validation sheet that contains aspects of presentation, content and material feasibility, graphics or appearance and language. The results of the experts' validation indicate that the learning device meets valid criteria.