He taught at the University of Perugia from 1477 to 1480 and while there he wrote a second work on arithmetic designed for the classes that he was teaching.
Siya nagtuturo sa University of Perugia 1477-1480 at habang doon siya wrote isang pangalawang trabaho sa arithmetic na naka-disenyo para sa mga klase na siya ay pagtuturo.