The aims of this research were to: 1) determine the validity of the results of the development of learning modules with discovery learning approach on the material of limit algebra functions; 2) determine the practicality of the development of learning modules; 3) determine the effectiveness of the development of learning modules. The development of the modules was done through the modified Four D, namelydefine, design, development, and disseminate. Data were analyzed using descriptive analysis. Validity analysis was based on an expert assessment. Practicality analysis was based on implementation of learning module. Effectiveness analysis was based on student response after using the module.The result concluded that: 1) learning modules with discovery learning approach to the material limit algebra functions declared fit for use by experts with the validity score of 3,44 and be in very good criteria; 2) learning modules expressed practical use in learning with the practicality score gained from the sheet of implementation of learning is 0,946 and be in very good criteria; 3) learning modules iseffective for use in learning with the scores of effectiveness obtained from the sheet of student's response to the module is 3,03 and be in good criteria.