“…There is empirical evidence demonstrating that the described early quantity-number competencies predict later mathematical school achievement (Aunola, Leskinen, Lerkkanen, & Nurmi, 2004;Koponen, Aunola, Ahonen, & Nurmi, 2007;Krajewski & Schneider, in press;Jordan, Kaplan, Locuniak, & Ramineni, 2007;Passolunghi, Vercelloni, & Schadee, 2007;Stern, 1997Stern, , 1999von Aster, Schweiter, & Weinhold-Zulauf, 2007;Weißhaupt, Peucker, & Wirtz, 2006; see also Gersten, Jordan, &Flojo, 2005, andOkamoto &Case, 1996 for the special importance of Levels I and II). Moreover, in studies focusing on children with mathematical learning disabilities, school children showed deficits in these quantity-number competencies (Gaupp, Zoelch, & Schumann-Hengsteler, 2004;Geary, Hamson, & Hoard, 2000;Geary, Hoard, Byrd-Craven, & DeSoto, 2004;Landerl, Bevan, & Butterworth, 2004).…”