The United States uses a variation of the Imperial system, known as the U.S. Customary Units, for its measurement values. However, most of the world uses the International System of Units, the modern iteration of the Metric system. The exam will likely provide some conversions and values for U.S. Customary Units measurements, but you are expected to know conversions for International System of Units measurements.

You are not expected to know conversions of measurements between the two systems, and you will be provided the conversion on the exam. Units of measurement for time are the same in both systems.

All of these conversions are ratios, meaning that for a certain amount of one measurement there is a certain amount of another measurement. Thus, conversions are the products of these ratios.

**Length Conversion Example**

**Mass Conversion Example**

These are important conversions of volume:

Here is one volume conversion problem. Once again, you can use the conversion formula for smaller units:

**Time Conversion Example**

Now that you’ve seen different units of measurement and sample conversions, think again about how to eliminate units to arrive at a final desired unit. One important thing to consider is that a variety of steps can be used to arrive at the unit you want.

For example, in the volume conversion problem, you converted 4 gallons to fluid ounces by converting to quarts, then pints, then cups, then finally fluid ounces. However, if you knew that 1 quart is 32 fluid ounces, you could skip two of those steps. Instead, you could surmise that 4 gallons is 16 quarts, thus (16)(32) = 512.

This is just one case, but conversions can be done in as many or as few steps as you need. What’s important is that the ratios remain intact.

- Convert 18,000 seconds into hours.
- Convert 2 meters into centimeters.
- Convert 4 miles into yards.
- Convert 10 gallons into pints
- Convert 3 tons into ounces.

**Answeres to Practice Problems**

- 5 hours
- 200 centimeters
- 7,040 yards
- 80 pints
- 96,000 ounces

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