Kraemer, Jean-MarieBrocardo, JoanaMendes, FátimaDelgado, Catarina2017-02-032017-02-032016-07http://hdl.handle.net/10400.26/17826Trabalho apresentado no 13th International Congress on Mathematical Education, 24-31 julho 2016, Hamburgo, AlemanhaengFlexibility in mental calculationconference object