Numeracy skills are fundamental competencies needed by students to solve daily problems and support academic success. This study aims to synthesize empirical evidence on the relationship between numeracy skills and mathematics learning outcomes using the Systematic Literature Review (SLR) method. A total of 10 articles from indexed databases for the 2022–2026 period were identified based on inclusion criteria. The review results show that all studies reported a significant positive relationship between numeracy skills and learning outcomes, with correlation coefficients ranging from 0.538 to 0.967 and an average contribution of numeracy to learning outcomes of 65%. The strongest relationship was found at the elementary school level. Factors such as mathematics anxiety, 4C-based learning models, teachers' cognitive activation, and family support moderate this relationship. This study concludes that numeracy plays an important role in mathematics learning success. Recommendations for teachers are to systematically integrate numeracy literacy reinforcement into contextual and problem-based learning.
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