“…These results have remained the same for every area of the educational curriculum, and very especially, for mathematics Hossain & Tarmizi, 2013;Lehrer & Lesh, 2013;Plass et al, 2013;Slavin & Lake, 2009;Suri, 2010), being this particular area of knowledge one of the most prolific in both manuals and compilations published (Davidson, 1990a;Sities & Buethe, 2010;Strebe, 2010), as well as in the different research carried out, something which has resulted in numerous research reports and hundreds of scientific and informative publications (Eisenhauer, 2007;Kagan & Kagan, 2005;Slavin et al, 2013).…”