I LOVE THESE CHARTS! One of my favorite things to do with these charts is to stash bills of single denomination. I typically use the 200# chart for one-dollar bills, the 150# chart for 5s, and the 100# chart for 10s and simply color an alien for each bill I put the envelope. Once we fill up any one chart, we'll do something fun as a family, and we usually plan for a certain event (like a haunted house for Halloween or a holiday lights maze for Christmas) to motivate ourselves to fill them faster. I also like to create surprise funds for myself by stashing bills of any denomination in a single envelope and marking off one alien for each contribution. This way I have the fun of filling a chart with the added motivation of being able to count it all once I hit the finish line. These are so fun, and my kids love them!