“…The studies conducted by Flores M.M. were mainly related to the effectiveness of teaching elementary mathematics to students with special needs using a concrete-representational-abstract sequence (i.e., Flores, 2010;, Flores & Milton, 2020Flores et al, 2014bFlores et al, , 2014cFlores et al, , 2016Flores et al, , 2020aFlores et al, , 2020bMilton et al, 2019;Stroizer et al, 2015). Thereupon, the studies are highly relevant in the related research domain with 'concrete-representational-abstract sequence' and 'elementary education' as the top keywords.…”