Here's how the game works:
The teacher writes a numeric expression in the crust of each pizza slice.
The expressions in the pizzas labeled with a 3 and 5 should be made increasingly more difficult to evaluate.
Make copies of each page, and make an answer key for yourself for each page (The expressions are to be evaluated in the non-crust part of each slice, showing each step. Hence, the expression gets skinnier at the bottom like a slice of pizza).
Each student receives the tier 1 pizza page, completes the whole thing, and brings it to a teacher to be checked. If correct, the student receives 1 ticket, which they can write their name on and put in one of the prize bins (the prizes are up to you).
Students must continue correcting expressions that were not evaluating correctly until the whole pizza is correct.
Once a student has completed the tier 1 pizza, he moves onto the tier 3 pizza with slightly harder problems on it. Completing this pizza allows a student to earn 3 tickets to put into whichever prize bin(s) they want.
The tier 5 pizza has the hardest problems and allows for 5 tickets.
At the and of class, do the drawing and hand out prizes.
This activity not only has the students practice the order of operations, but also has them practice writing their work in a form that looks nice and neat, showing all steps (pizza slice form).