RT Journal Article T1 Mathematical argumentation of three-year-old children on a classroom experience based on two STEAM domains A1 Salgado Somoza, MarĂ­a A1 Berciano, Ainhoa A1 Abad-Villaverde, Beatriz K1 Mathematical argumentation K1 Reasoning and proof K1 STEAM activities K1 Early childhood education AB In the last decades, the importance of argumentation as a human competence in general and its close relationship with mathematical comprehension in particular has been highlighted. Thus, in this paper we focus our interest on analyzing the argumentation skills shown by three-year-old children in a STEAM classroom experience. For this purpose, a qualitative study was carried out. For data collection, a STEAM task has been designed in which mathematics and science are worked together from the study of the physical properties of water. Specifically, what color and taste of water has by means of two experiments and, subsequently, photos and video-recordings have been collected during the implementation carried out in a classroom with 20 children of three-year-old. All data collect have subsequently been transcribed and categorized. The results indicate that the children, during the experiments done, mainly use arguments based on mathematical language, numerical figures, or make use of words or spelling, although with considerable imprecision in the type of language used. In addition, the experiments carried out have allowed a high percentage of children to change their previous ideas and have a more comprehensive approach to the concepts introduced, highlighting the importance of working on argumentation in early childhood education through contexts, in this case STEAM, which encourage reasoning and proof PB Modestum SN 1305-8215 YR 2024 FD 2024 LK https://hdl.handle.net/10347/39974 UL https://hdl.handle.net/10347/39974 LA eng NO Salgado, M., Berciano, A., & Abad-Villaverde, B. (2024). Mathematical argumentation of three-year-old children on a classroom experience based on two STEAM domains. Eurasia Journal of Mathematics, Science and Technology Education, 20(2), em2402. https://doi.org/10.29333/ejmste/14187 NO This study was partially supported by Research Project PID2021-122326OB-I00 and by Research Group GIU21/031 of the University of the Basque Country (UPV/EHU) DS Minerva RD 28 abr 2026