“…In light of the importance of early mathematical skills, there is an extensive interest in conducting early intervention in mathematics (e.g., Dyson et al, 2011;Dyson, Jordan, Beliakoff, & Hassinger-Das, 2015;Griffin, 2007;Mononem & Aunio, 2016;Nunes et al, 2007;Nunes et al, 2015;Shanley et al, 2017;Toll & Van Luit, 2012), of which several have been determined to be efficient. A review of intervention studies by Gersten et al (2005) as well as the meta-analysis of Gersten et al (2009) suggest that the most effective instructional design for struggling learners is one that is both systematic and explicit.…”