I needed a time number line to help my third graders with elapsed time problems. I couldn't find one that was just right, so I created this one. There are four strips on one page, that when attached form a complete 24 hour number line. The top counts by 15 minute intervals, and the bottom is numbered by tens, but the 5 minute increments are marked on the number line. How can I use this product?I included directions that are self-guided, so it can be set up as a math center as well as a whole cla