As my fourth graders prepare for store, they take inventory of all the tokens they've earned for good behavior. I have one particular student who absolutely cannot concentrate on counting when others are counting around him. "STOP TALKING", he'll insist, as he himself continues to count out loud. Finally today I said: "Hon, just take off your hearing aids if you need it quiet to count". He was happy to tear them off.
Looking back, it may not have been the smartest thing to call his attention to the fact that he can selectively hear whenever he wants, but for today, it stopped the whining, and that was really all that mattered.
This same student had twenty-five tokens and took a lot of time deliberating over what prize he was going to buy at my "store". He thought through a few scenarios, working out the subtraction on the board to see how many tokens he would have left if he bought x or y or z. He finally settled on two pieces of candy, but walked away afterwards declaring: "I will spend no more and I am NOT kidding".