Have students answer the questions on the Math-o sheet for homework. Take up solutions the next class. Have students place their correct solutions anywhere on their Math-O card. Use all 24 solutions only once.
Teacher prepares solutions and places answers on small pieces of paper. Put pieces in a ziplock bag and draw one solution at a time.
Students can use a highlighter or pen to cross off their answer. Games are continuous. Play all three games on one Math-O card. I usually give some sort of prize to the winners.