Here's one we used to keep track of the days left to visit family in Alabama. My teacher heart absolutely LOVED all of the hidden opportunities the chain provided to expose my little ones to number sense. We had some great discussion about subtraction, totals, remainders and lots of great practice with good ol' plain counting!
Do you have different idea for a countdown chain? Maybe one you and your kiddos have used? I'd love to hear! We'll be getting our Christmas countdown together before we know it! :)