Which is the best strategy to use to solve this problem?

Sophie wants to make a large rectangular sign that has an area of 60 square feet. She wants to put a border around the sign, but she wants to use as little border material as possible.

What are the dimensions Sophie should use for this sign?

A.
Write a number sentence.

Use a number sentence to calculate the area of a rectangle. Use guess and check to find two numbers that when multiplied will give a product of 60.

B.
Make a list.

Create a list of all possible whole-number combinations of length and width that would equal an area of 60 square feet. Then start calculating the perimeter of each rectangle. Look for a pattern to decrease the number of calculations you have to make.

C.
Use objects to model the problem.

Arrange 60 square tiles in different patterns that create a rectangular shape. Count the number of tiles on the perimeter of each of the shapes.

Mathematics

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