Celebrate the 100th day of school by making a cooperative pizza. Divide the students into 5 groups. Each group gets a set of toppings (8 onions, 8 pepperoni slices, 8 olives, 8 peppers, and 8 mushrooms). They need to decide which 20 toppings they would like to put on the group pizza (see recording sheet). After completing the recording sheet, they cut out and glue their toppings on a GIANT COOPERATIVE PIZZA (butcher paper works well). Finally, all of the students work together to figure out the total of all toppings used! YUMMY!