When the five minutes were over, I would say, "Please shred the piece of paper. Put the little pieces in your pocket or in your backpack, and tell me how many questions you got correctly."
Pasados los cinco minutos, les diría, "Por favor rompan sus hojas y pongan los pedazos en su bolsillo o en su mochila, y díganme cuántas preguntas contestaron correctamente."