*Basketball Showdown: Each child takes turns answering an addition, subtraction, multiplication, or division problem. You can use flash cards. If the child gets it right, he/she takes a shot (2 or 3 pointer). The child with the most points will win. You can even adapt this to soccer, football, baseball, etc.
*Hula Hoop: For younger kids, let them count how many items are on a card. They will move their hula hoop that many times.
*Hopscotch: Put numbers on each square. Make up math problems that will match the numbers. Kids have to hop over the number to the problem.
*Water Sprinkler Rush: Kids have to correctly answer a math problem. You can even include fractions, telling time, measurement, etc. If they get the right answer, they get to go through the sprinkler. You can even use a water slide or water gun.