Basic to the understanding of unit conversion is the understanding equivalence, the understanding of the multiplicative identity of 1, and how the two are related. For a review of these concepts, click on Review.
If you have forgotten how to manipulate fractions, visit Fractions for Adults on SOSMath for an in-depth review.
Review the following table (Webster's New World Dictionary, Second Edition, Simon and Schuster, 1982) of Standard Units of Conversion to see if you can create fractions that have a value of 1. You can click to examples following each table.
Problem 1: Convert 25,000 feet to miles.
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Author: Nancy Marcus