Creative mathematics: two activities
Pauline Davies · The Arithmetic Teacher · 1976
In my fifth-grade mathematics class, we wanted to simulate a card-sorting system for the retrieval of information. Since I had a quantity of unused, discarded time cards from a construction company, we used them for our cards. In the interests of time, accuracy, a limited supply of cards, and the availability of only two paper punches, the cards were punched with twenty-eight holes beforehand. The children did all of the remaining work on the cards.