This is a set of 24 cards (more can easily be added) that are formatted to print directly on to a 3 X 5 index card. Each student receives a card and must match themselves up with the person who has the same value as their own card. For example, 50% must find 1/2 and vice versa. I have played this many ways with my students, but I find it best to use a timer and enforce the "No talking Signals only" rule. Middle school students especially enjoy being able to get up and walk around and they love the challenge of trading cards and finding a new partner to beat their old time.