A great circle scavenger hunt for grades 4-9. Find things like a yellow circle with a diameter less than 3 inches or three circles the same color, but with different circumferences. Great use of vocabulary! The students love it. I asked Target for collection bags (circles on them) and they were happy to provide, I also give circle prizes for winners. I usually put a Lifesaver mint (circle) in the bag which could be used as an answer, but some students eat right away and that is fun too!