Build a Turtle Pen

Let’s build a fence for our turtle. I’ve purchased 24 feet of fencing from Home Depot. My pen needs to be in the shape of a rectangle. How many different pens can I build? If I use all 24 feet for each option, will the perimeter remain the same? What happens the area when I go from a one foot wide pen to a two foot wide pen? See student work. I start the activity with flat toothpick. Students can concretely build the 1 x 11 pen and so on..