Making Cents

One of my favorite activities with students is asking them to calculate how many pennies it takes to cover the floor. Take ~20 pennies, a ruler, some string, and go crazy.

Well, this person really figured it out:

I would want to show kids this picture and have them generate questions that come up. Some questions that come up for me:

• How big is the floor? 
• How many pennies? 
• Are there more dark-side-down or light-side-down pennies? An equal number?