This game channels the original battleship game. Students mark their ships on their board. When they are trying to sink the opponent's ships, they mark their guess on the opponent's ships board. The person who sinks all of their opponents ships first wins. This can also function as mixed numbers on a number line.
I used folders as the game boards, and laminated the ship maps on the inside. I allowed students to mark ships with dry erase markers so the game could be played may times with the same board. These can also be put in plastic sleeves for dry erase play as well.