<![CDATA[Indonesian students' numeracy literacy and mathematical problem-solving abilities remain low, as reflected in the 2022 PISA results which ranked Indonesia 70th out of 81 countries. This study aims to systematically examine the relationship between numeracy literacy ability and students' mathematical problem-solving ability in solving Higher Order Thinking Skills (HOTS) problems based on a synthesis of research published from 2021 to 2025. The method used is Systematic Literature Review (SLR) with the PRISMA framework. Data sources were obtained through Google Scholar using the Publish or Perish application, applying strict inclusion and exclusion criteria, resulting in 12 selected articles from SINTA-indexed national journals. The results show that numeracy literacy of junior and senior high school students is generally still in the low to moderate category when facing HOTS problems. There is a positive and significant relationship between numeracy literacy and mathematical problem-solving ability, proven through its direct connection to the four stages of Polya's problem-solving. The most dominant errors are transformation errors and process skill errors. These findings imply the need to shift mathematics learning from a formula memorization approach toward habituation of real-context problems that demand high-order reasoning.]]>
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