00853nam0-22003131i-450-9900014992204033210-631-13581000149922FED01000149922(Aleph)000149922FED0100014992220021216d1986----km-y0itay50------baengGBa---a---001yyChildren and numberDifficulties in learning mathematicsMartin HughesOxford [etc.]Blackwell1986195 p.ill.23 cmInsegnamento della matematica372.7Hughes,Martin352479ITUNINARICAUNIMARCBK990001499220403321CPDM-97-05470 CPDMMA1MA197-XXChildren and number377321UNINA