This is a Positive Reinforcement Strategy I used in my 5th grade class. When I noticed the whole class was on task I would put up a bingo card, when they got 5 in a row they got an extra recess. After Bingo they worked towards black out and would get a class party.
I printed this sheet out on bright orange and then again on bright green and cut out all the numbers on one of them. I had a bag I kept all the numbers in and drew out of that for bingo. All Laminated of course.