Figure 1: Test participant using the system. Hands-On Math: A Training System for Children with Dyscalculia Georg Erfurt Eva Hornecker Jan Ehlers Bauhaus-Universität Weimar 99423 Weimar, Germany georgerfurt@gmail.com eva.hornecker@uni-weimar.de jan.ehlers@uni-weimar.de Silke Plaschkies IPF Institut für pädagogische Förderung 99867 Gotha, Germany IPF-Gotha@live.de ABSTRACT Dyscalculia afects comprehension of numerical mathematical problems, working with numbers and arithmetics. We describe our work on a training system for an exercise that trains connections between verbal and numerical representations of numbers and finger counting. Fingers support embodied cognition and constitute a natural numerical representation. We describe the design rationale and iterative development process, and first evaluation results for our system that enables children to train without guidance and feedback by a trainer. KEYWORDS Embodiment; Learning; Counting; Neurodiversity; Gesture Input; Marker-based tracking. Permission to make digital or hard copies of part or all of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for third-party components of this work must be honored. For all other uses, contact the owner/author(s). CHI’19 Extended Abstracts, May 4–9, 2019, Glasgow, Scotland Uk © 2019 Copyright held by the owner/author(s). ACM ISBN 978-1-4503-5971-9/19/05 htps://doi.org/10.1145/3290607.3313012 CHI 2019 Late-Breaking Work CHI 2019, May 4–9, 2019, Glasgow, Scotland, UK LBW1110, Page 1