Vol. 40 Num. 3 (2020) - front cover0 David A. Reid Editorial2 Giulia Ferrari Moving as a circle: folds and nuances of a mathematical concept ABSTRACT 3 Nicole Panorkou Dynamic measurement reasoning for area and volume ABSTRACT 9 Alison Mirin , Dov Zazkis Function sameness: bringing coherence to implicit differentiation ABSTRACT 14 Ali Barahmand Communication: Equivalent fractions and natural number bias20 Annie Savard , Alexandre Cavalcante , Louis-Philippe Turineck , Azadeh Javaherpour Communication: Some considerations towards the concept of money in elementary school: money as measurement22 Chiara Andrà , Giulia Bernardi Reversal theory to understand students' difficulties with graphs in mathematics ABSTRACT 25 Moritz L. Sümmermann , Benjamin Rott On the future of design in mathematics education research ABSTRACT 31 Jean Dionne , Bernard Hodgson Communication: À la mémoire de Claude Gaulin (1938-2020)35 Joaquin Giménez Communication: Learning the role of integrating perspectives from Claude Gaulin37 Paola Ramírez Communication: A reflection on Ros Sutherlands book: Education and Social Justice in a Digital Age38 Trude Fosse , Tamsin Meaney Using problem posing to bring real-life into the mathematics classroom: can it be too real? ABSTRACT 40 - Index to Volume46 - Contributors48
