This is a "fun fact" worksheet that can serve as practice for your students using the factoring technique known as Greatest Common Factor.
This "fun fact" worksheet is in the same mold as the common riddle worksheets you have most likely seen. However, this worksheet reveals a fun and interesting fun fact at the end.
My students love these because they can check their own work. They also like them better than the common riddle worksheets because they are just a little different. They love trying to guess the interesting fact and we also have fun conversations about the facts, as well.