Math Nook's Time/Elapsed Time Clock is a great application that helps teach elapsed time. Features include: 4 modes - show, quiz, random and random 5 mode; easy to resize and move clocks to take advantages of larger displays; interactive whiteboard friendly; and uses vector graphics that stay sharp looking when resized. Video link to demonstration of this product is available on www.mathnook.com in the Teaching Tools section or video can be found by searching for "elapsed time clock mathnook" on www.youtube.com.