http://docs.google.com/gview?a=v&q=cache:GFk3Q6M6hUMJ:www.matematickapointa.sk/dokumenty/9/problemy_ucitelov_preelementaristov_pri_rozvijani_matematickych_predstav.pdf+matematicke+predstavy+pre+deti&hl=sk&gl=sk&sig=AFQjCNEIcvPqtN-KRKQr7-iSZrpnufwrwg