These bingo games are designed for small math groups. There are only eight squares on each board so the games are quick to find a winner. If I have more students playing I simple print more boards and two people win. We swap game boards and play again, allowing for maximum exposure to the content.
Another variation would be to use the boards as an individual matching game. I have made the call cards the same size as the bingo squares so you have this as an option. Simply print each child a set of call cards.