Application development of dictionary of mathematical terms as a learning medium

In mathematics learning in schools, teachers only focus on teaching the application of formulas in mathematical problems. However, it is not realized that students find it challenging to participate in learning because they need to learn the meaning of terms and symbols in mathematics. As a result, a decrease in student mathematics learning outcomes is inevitable. Therefore, researchers develop learning media in the form of feasible, effective, and practical applications to improve student mathematics learning outcomes. The method used is Research and Development (R&D) with 4D stages designed into 3D. The subjects of this study were 35 students from class XII IPA 3 MAN Batu Bara with instruments in the form of questionnaires and tests. The results of this study showed a percentage of 95.83% of media experts, 90% of material experts, and 96.875% of lesson teachers who represented that the product was considered feasible and practical to use. The N-Gain test results showed the effectiveness of the product by 0.8. So, the application can be used in learning as a viable, effective, and practical medium