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The research was aimed to show that developing a learning media impacted to improve students ability in mathematical learning. The process implementated the application of VBA for microsoft word in mathematical learning. The formulation of the problem in this research are whether 1) can developing media assisted VBA for microsoft word improve mathematical ability? 2) Did Students show positive response in learning process? ADDIE was used as approach in this research. There are five stages in ADDIE approach. Population of this research was in group with 34 samples of vocational students. The instruments are cognitive test, interview and observation. Based on the results of the process, there was an increasing in mathematical ability of vocational students in trigonometry lesson through media VBA for microsoft word. The implementation of learning process through media VBA for microsoft word was success. Students enjoyed the process, active, responsive, and enthusiastic. The conclusions are the developing of media VBA for microsoft word can improve mathematical ability of vocational students before and after using media, and students showed positive response to learn by media in trigonometry.