Left and Right Hand

It is quite frustrating to have to teach a fourth grader which hand is which. Maybe I set my bar too high, but by eight years old, you should know left from right. But, then, I would be a hypocrite since I confuse my left and right when giving out directions. But when doing kata, you must know which way to turn. So, how can we teach the kids to turn in the correct direction with the correct foot or arm forward? Someone tell me a possible solution or a good method.