Grade 5

In responding to this Headline Story, students should consider how Dave might figure out and compare the costs of different size squares and rectangles that he might fence in.

While planning to fence in a rectangular part of his yard for his dog, Dave thought that part of his decision about the size and shape of the region should depend on the cost. He knows the cost of a foot of fencing.

- Dave could measure the perimeters of different squares and rectangles that would fit in the yard.
- He could measure to the nearest foot and then multiply by the cost per foot to find the total cost for each of the figures.
- He might find that some of the possible configurations have the same perimeter and choose between these two by considering how much area is inside each fence.

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