Group Activity Cards
Geometry
Number of players: 2
Materials: String, scissors, compass, index cards

String Thing 
Cut two 1meterlong pieces of string.
In this game, the sum of the circumferences of circles you draw cannot exceed 1 meter. In each round, each partner writes on a card the measure in centimeters of the radius of a circle. Since the sum of the circumferences cannot exceed 1 meter, you cannot write a radius length that is greater than 15.9 centimeters (the circumference of a circle with a radius of 15.9 centimeters is about 1 meter). Both partners flip their cards over at the same time. Then, using the same center, both partners draw on a sheet of paper a circle with the radius length shown on their cards. Each partner takes a string, measures the circumference of his or her circle with the string, and then cuts off the length of the circumference. The partner with the larger circle wins the round, provided that this partner has enough string to measure the circumference of the circle. Try to win more rounds than your partner before you run out of string.
