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Huda, Nuril ORCID: https://orcid.org/0000-0001-5867-3185, A’yun, Arini Qurota and Marhayati, Marhayati ORCID: https://orcid.org/0000-0001-7092-8080 (2023) Ethnomathematics: Concept of proportion in the process of making special blitar pecel sauce. Presented at The 7th International Symposium on Mathematics Education and Innovation (ISMEI 2022), 5-6 Oct 2022, Yogyakarta.