Abstract
Mathematical self-efficacy is a person’s belief in his ability to solve mathematical problems received. The output of this study is to produce an instrument that can measure MSE comprehensively and accountability. Research and Development (R&D) was chosen as the research method. The sample selection was done by purposive sampling involving 20 students of the 6th-grade elementary school in Karawang. Based on the development and analysis of aspects and indicators showing aspects of MSE including personal experiences in learning mathematics, the experiences of the others about learning mathematics, verbal persuasion after doing mathematics, and psychological indexes when doing mathematics problems. Each of these four aspects consists of three indicators namely confidence can complete difficult, varied, and challenging tasks. Based on the results of testing, the validity and reliability obtained all items have sufficient validity (rxy = 0.54) and fixed reliability (r11 = 0.70). Based on these findings, 24 items can be further researched on mathematics learning in elementary school concerning 3D geometry.
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