Write a number of problems such as _< 2, or _ > 3 with a bold pen on construction paper. Divide the class into two equal teams. Clear desks to the sides of the room or play outside. Place a pile of number cards on one side of the room.
The two teams stand on the opposite side facing the number cards. You stand near the teams and hold up one of the problem cards. The first two people run to the other side of the room, pick up a correct number card that completes the problem, and runs back to the team. The team with the most correct number cards wins.