EDiMaST: Experiences of Teaching with Mathematics, Sciences and Technology https://www.edimast.it/index.php/edimast <p>EDiMaST deals with educational research methodology and assessment research in education.</p> Panagiote Ligouras en-US EDiMaST: Experiences of Teaching with Mathematics, Sciences and Technology 2421-7247 Stick, twine and a pinch of the internet: we measure the Earth today with the method of Eratosthenes https://www.edimast.it/index.php/edimast/article/view/67 <p>The study is based on laboratory experience carried out in several classes of a professional institute in Milan and a middle school in Genoa that invites to replicate the procedure followed by Eratosthenes 2300 years ago to measure the terrestrial meridian. The course followed by the students is described, divided into several phases with outdoor activities, the situation is modelled through the plane Euclidean geometry, the mathematical problem is posed and the resolution analyzed. Finally, the didactic value of the experience is discussed and the use of the Internet is evaluated to determine the distance of the place where the equator is located and to exchange data between twin schools participating in the Eratosthenes Experiment event.</p> Massimo Trizio Stefania Donadio Copyright (c) 2019 Massimo Trizio, Stefania Donadio http://creativecommons.org/licenses/by/4.0 2020-06-03 2020-06-03 5 649 673 Semigroups, monoids and free groups https://www.edimast.it/index.php/edimast/article/view/64 <p>The purpose of this paper is to present the experience with mathematics teachers and students of 21 years of age concerning some abstract algebraic structures and to observe how these concepts have been perceived.</p> Panagiote Ligouras Copyright (c) 2019 Panagiote Ligouras 2019-12-23 2019-12-23 5 633 648