To convert a distance of 12,000 feet to miles, which ratio could you multiply by?
The correct answer is C. D is incorrect because inches aren’t involved. B is incorrect because there are 5280 feet in a mile, not 5280 miles in a foot. That leaves you with A and C. Since you are already in feet and want to get to miles, you want miles in the numerator and feet in the denominator, because the 12,000 feet will cancel with the 5280 feet in the denominator. You also know that since a mile is much larger than a foot, your answer in miles will be much less than 12,000. If you multiply by 5280 (as in A) your answer will be extremely large, but if you multiply by1/5280 (as in C) you will get the correct answer.
