“…A virtual abacus, focusing on base-ten numeration, was used with one class and 'passenger train' (freeware designed to facilitate student use of numbers to record the position of passengers, rabbits, on a train) with the other class. Gueudet et al (2014) note similarities and differences with Drijvers et al (2010). Regarding similarities, BFor the introduction of a new software, the Technical-demo, Explain-the-screen, and Discuss-the-screen orchestration types introduced by Drijvers (2012) are still present ( Gueudet et al, 2014, p. 230).…”