Included are a class set (30) Bingo cards and a question sheet with 27 problems (2 variations per problem). Each student had to work the problems on a scratch sheet of paper, which was turned in for credit. I didn't go on to the next question until 95% of the class had it covered on their bingo sheet.
I passed plastic chips for students to cover the answer on their card, but you can always laminate them and have them cross out their answer. Great activity after learning about proportions for review. This goes with the Math 7, common core curriculum.