To do this activity you will need two new quarters. You will rotate one quarter once around the circumference of the other. If the portraits of George Washington are both facing the same direction when you start this rotation, what way do you think the portrait on the rotated coin will face at the end of the rotation?

How many times do you think the portrait on the rotated quarter will go around when the coin in rotated once?

Now that you have made your predictions, do the activity and see what happens. Try not to let the moving quarter slip as it is rotated around the stationary quarter.

What actually happened?

The challenge in this puzzle is to explain why this happened. Share your thoughts in the space below.