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La sottrazione è l’operazione inversa dell’addizione, che non ha però le stesse proprietà, ma di sicuro la stessa utilità. Tra biscotti, figurine e salti sulla retta dei numeri si potranno cantare le applicazioni di questa operazione in tante situazioni.
Il gioco associato a questa canzone è “La corsa allo 0”; si tratta di sfidare amici e familiari ad arrivare per primi al numero 0, alternandosi nell’eseguire delle sottrazioni a partire dal numero 45.
- La corsa allo 0: scarica il gioco
https://cook.cue.rsi.ch/rsi/web/podcast/a-spasso-con-i-numeri-naturali/rqotau-La-corsa-allo-0-scarica-il-gioco/download/La+corsa+allo+0.pdf
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