There are 16 problems written on the outside of the oval. There are 16 answers written on the inside of the oval that match the 16 problems. (Answers are not written next to their problem, instead they are next to a random problem.) Students pick any problem to start with. They will estimate the square root to the nearest tenth and then draw a line connecting it to the answer. Once there, they will estimate the new problem to the nearest tenth and connect it to the corresponding answer. As they continue, the problems will bring them back to the original problem creating a path. There are a total of three different paths (as indicated in my answer key.) Once students finish all three paths, they can color the different areas to create a stained glass window.
There is a copy for estimating by hand and by calculator.