The purpose of this study is to describe the preparation of media such as video mathematics teaching junior high school students of class IX-based K-13 curriculum. This research includes R & D (research and development) or the type of research development. Development undertaken is the development of mathematical learning media in the form of video lessons for junior high school students of class IX. Product generated in this study are instructional videos on material congruency. In this study

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... sing ADDIE development model, namely Analysis (Analysis), Design (Design), Development (development), Implementation (Implementation), and Evaluation (Evaluation). In this research phase is done only at the stage Development (Development). Based on the assessment of media experts that the two professors and one teacher from the aspect of media, presenting aspects of learning, language aspects of feasibility, and feasibility aspects kegrafikan percentage of feasibility study media at 91.82%. Once converted to a percentage scale conversion tables 91.82% level of achievement that are in very good criteria so that it can be concluded that the instructional video on congruency decent material applied in learning.Subsequently validated by subject matter experts. Researchers validate by two professors and one teacher from the aspect of media, aspects of material substance, and the design aspects of learning have a percentage of 85.93%. Once converted to a percentage scale conversion tables 85.93% level of achievement that are in very good criteria so that it can be concluded that the similarity decent video learning material applied to research by improving the delivery of content in the form of a sequence.