Math Carnival

I started to talk about our end of the school year "Math Carnival" where students will work in groups to create carnival games, making rules for their game, and strategizing about profitability.  One boy said his older sister told him about this happening in fourth grade and how she loved it!
The Math Carnival idea is just an extension of a probability lesson in the Everyday Mathematics teacher's manual, called "A Cube Drop Experiment".  Here students make a mat that has 100 squares on it, coloring one square yellow.  What are the chances of dropping a cube on yellow? 1 in 100, so 1/100 or 1%.  35 squares are blue, so that's a 35/100 or 35% chance.
Loads of fun! 
For the in-class carnival, real carnival tickets are used as prizes, with a raffle culminating for prizes from a prize box. 
With three groups of students playing each others' carnival games at the same time (approximately 90 students) the activity level really feels like being at a carnival!