This is Bingo game is a great way to review or practice the important skill of simplifying expressions. To start the game, have each student create their own game board using a pen or marker (if they use a pencil, they may try and move their answers to get a bingo quicker). Before I begin the game, I walk around to make sure that all the game boards have been completed and write the numbers 1 to 20 on the board. To play the game, I usually will accept a traditional Bingo, box of 4 together, or the four corners at the beginning of the game. Once a student gets one of them, no one else can win with that combination. After that I allow for double bingos (2 lines) and blackouts. It just depends on how long you want the game to last. When they mark their boards, they can color it in or put an "X" over it...just make sure that you will still be able to see what they crossed off.
To ensure that I don't do the problems in order, I go around the room and ask students to pick a number from the board. The number they choose is the number of the problem I put on the board. Be careful NOT to work out all the problems (they will stop working). To help me stay organized, I hi-light the answers on a blank bingo board so I can easily check the students' bingos.
The directions are a little confusing for them at the beginning, but they will get used to. It is great to play, and the kids love it. I usually offer extra credit or candy every time a student wins. I have had students win 3 free homework assignments in one class!