Word and Logic Problem Box
As you come across interesting math or logic problems, write them down on index cards. Keep an index card in the Math Center area of your classroom and when students finish with their center work, they may work on a problem from the Problem Box. If they finish a test or a whole-class activity early, they can work on a problem. You can also choose a problem to have the class do while they are waiting to go to lunch ,etc--as a sponge activity.