Confusing Units of Measurement in the United States

In my math class we reviewed how to convert units of measurement in the metric system and the U.S. customary system.  As a student, I often wondered why we have to learn the metric system as well as the U.S. Customary Unites.  Do children in other countries have to learn both?  I did a little research to find out why the United States hasn't switched over to the metric system.  I wanted to find out:

• Why hasn't the United States switched over the the metric system?
• If the U.S. switched to the metric system, how would things change?

Here is a visual to help students make conversions in the U.S. customary system:
 



Obviously, these conversions can be hard to remember for beginner students.  Here is a trick to help them remember that two cups equal a pint, two pints equal one quart, and so on.