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9-22.

Griffin ran miles. Griffin was a football fan so he wondered how many times he had run the equivalent of the full-length of a football field ( yards). How many times did Griffin run the length of a football field when he ran miles?

Read the Math Notes box in Section 2.2.4 to find common conversion factors.
Read the Math Notes box in Section 2.3.1 on dimensional analysis.
How many yards are in a mile? If you don't know, then how many feet are in a mile?

times or times considering precision of measurement