Bingo is everyone’s favorite pastime in school. “Find the Sum” Bingo is an excellent way to encourage your students to memorize their basic facts and solve a handful of more complex (2 digit by 2 digit) problems. With a variety of cards, you can be sure that nobody will get the same card. If you have a larger class, you can print out the blank card to have your kids create their own board. This is an easy, no prep activity for you. There are problem calling cards to call out with the addend and sum right there for you. Enjoy!