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.

**LinearMeasure**

**Example 3: ****You are traveling in Mexico and the speed
limit is 80 kilometers per hour. Your car speedometer reads in miles. What
is the speed limit in miles?**

**Solution:**

- The speed limit of 80 kilometers per hour can be written as the
fraction

- Multiply by 1 in the form :
- Multiply the two fractions:

=

- Rearrange the numerator so that the word kilometer is to the
right.

- At this point, you could simply cancel the kilometer in the numerator
with the kilometer in the denominator. Be sure that you understand why you
can do the canceling.

- If the speed limit is 80 kilometers per hour, you would be safe if
you kept your car just under 50 miles per hour.

If you would like to review another example, click on **Example**.

If you would like to practice some problems click on **Problems**.

If you would like to go back to the table of contents, click on **
Main Menu.**

Do you need more help? Please post your question on our S.O.S. Mathematics CyberBoard.

Author: Nancy Marcus

Fri Aug 2 12:03:12 MDT 1996

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