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Students are grouped by ability within their Mathematics classes ...

„On average across 26 EU 13 % of 15-year-olds are in schools reporting that students are grouped by ability within their Mathematics classes in all classes; 33 % are in schools whose students are grouped by ability within their classes in some classes and 54 % are in schools reporting they are not grouped by ability within any of their classes.“

EU-Kommission (Hrsg.), „Teaching Practices in Primary and Secondary Schools in Europe“ (2015), S. 76