https://new.edmodo.com/groups/classe-quarta-23383299
https://wordwall.net/resource/1782211/matematica/spesa-ricavo-guadagno-e-perdita
https://wordwall.net/resource/946012/spesa-guadagno-ricavo
https://wordwall.net/resource/2036486/matematica/compravendita-significati
Giochi compravendita
Daniela Corradi