There are 25 problems on simplifying exponents.
There is a BINGO page with the answers.
I tell my students that they only have to work enough problems to make a BINGO. The answer key is the BINGO page. If students work 1-17, they will BINGO. I find most students skip around and work at least 20 :)
I teach the exponent property rules and use this as an independent practice activity. I usually give a treat for the first BINGO.