This is a fun, hands on game to help your students practice distinguishing between prime and composite numbers. Students spin a spinner to determine which fly to swat at, and then swat to collect cards and points. There is a variation of a spinner provided where you can also practice divisibility rules. Provided is an instruction page, 2 spinners, and flies numbered 2-109. Just print the numbers off on cardstock or laminate. You'll need to provide your own fly swatters, or you can just have students use their hands.