Abstract
Education world through learning in the classroom has a huge influence in building the values of student characters. Mathematics as a subject is given at all levels of education and has more time allocated each week than other subject has the opportunity to build student character value. This study aims to develop mathematics student worksheets and their effectiveness in the context of student character. This type of research is research with design and development. This research consists of three stages, namely Self Evaluation, Prototyping, and Field Test. The initial step of the research is to use various sources in the field and literature review. Product design is done by preparing student worksheets and student character observation sheets. Products that have been designed are then developed by means of judgment, trials and revisions. From the results of the development then a student worksheets hypothetical product is obtained and will be tested for its effectiveness. Effectiveness testing is carried out in the use of trial activities through the implementation of student worksheets hypothetical product. The results showed that the hypothetical student worksheets was effective in establishing honest, maos, mamaos, tanginas, someah, sauyunan, and discipline characters.