The students (or teacher) pull a subtraction equation from the treasure chest. Students attempt to answer the problem, then drag the equation through the magic tunnel to determine if the minuend or subtrahend they chose was correct. Complete instructions are included in a pull-down menu on the 2nd slide. There are at least 15 equations hidden behind the chest, but teachers can easily add their own equations. Just remember to place them on the middle layer. Although this activity was produced for the Promethean ActivBoard, it can easily be adapted for most interactive whiteboards. Here's hoping your experience is magical - The Mathemagican.