Use this as a review activity for adding and subtracting integers. The problems have both positive and negative numbers. Cut out each card and place them around the room. (I like to hide them under tables, chairs, etc.). Students may start at any card and solve the problem on the bottom of the card. When they think they have the answer, they will try and find the card with that number at the top. When they do, they work the problem at the bottom of the new card they found. If they cannot find their answer, it means they did not do the previous problem correctly and they must go back and rework that problem. I have them work in groups of three and have them write down their answers on the answer sheet.