“…However, surprisingly few studies thus far examined the learning of percentages as another format of rational numbers (but see: Erdem et al, 2021;Gay & Aichele, 1997;Guiler, 1946bGuiler, , 1946aLembke & Reys, 1994;Parker & Leinhardt, 1995). This seems surprising as recent research repeatedly indicated fraction understanding to robustly predict not only later mathematical achievement (Bailey et al, 2012;Barbieri et al, 2021;Booth & Newton, 2012;Siegler et al, 2012), but also academic and life prospects more generally (Duncan et al, 2007;Murnane et al, 1995;National Mathematics Advisory Panel, 2008;Ritchie & Bates, 2015;Rivera-Batiz, 1992).…”