Based on Albert Bandura' Social Cognitive Theory the objective of the present study was to verify the existence of relations between self-efficacy beliefs and performance in mathematical problem solving. It also sought to evaluate the mathematical self-concept and self-efficacy for self-regulated learning. We attempted to study the correlation between the instruments and evaluate the mathematical self-concept and self-efficacy for self-regulated learning, and other relevant variables. Participants were 131 fifth graders, 72 males and 59 females from in a private religious school in a large city in the southeast of the country. Data have been collected in regular class schedules and included the following instruments: self-efficacy scale for regulated learning, self-concept-scale, importance of mathematics, and mathematics self-efficacy instruments 1 and 2. Results revealed that both mathematics self-efficacy, and self-efficacy for self-regulated learning were related to performance on solving problems. 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