Need a beautiful numberline for your camping theme? Here are jars filled with fireflies from zero to thirty. Print them out on card stock, laminate and cut. I would recommend putting them on a dark blue backgound to help the "glass effect" pop against the "night sky." Jars that are counted by 2's have grass inside the jar, ones that are counted by 5's have snails on top, and those counted by 10's have a bow around the lid. Now . . . there's some common core camping fun!