Split students into tables, give each student a personal whiteboard and assign each player at each table a letter either A,B,C, or D.
Give teams 5 minutes to create the castle they will be defending on a sheet of anchor chart paper.
Show the problems you plug into this ppt on the projector to review and every player in the game has a question to answer on their board (table 1 has a player "A", table 2 has a player "A", and so on for letters A-D), draw random names to check a person after 45 seconds of problem solving and if that person got their answer right, they get to place 2 red "strikes" on any opposing team's castles they want.
Once your castle has taken 10 strikes, it is considered "destroyed" and that team may continue playing, trying to get revenge on other team's castles..
Directions page is also included in the PPT!