Measurement for Praxis II ParaPro Test Prep Study Guide
The practice quiz for this study guide can be found at:
This section reviews the basics of measurement systems used in the United States (also called the U.S. customary system) and other countries, methods of performing mathematical operations with units of measurement, and the process of converting different units.
The use of measurement enables a connection to be made between mathematics and the real world. To measure any object, assign a number and a unit of measure. For instance, when a fish is caught, it is often weighed in ounces and its length measured in inches. The following lesson will help you become more familiar with the types, conversions, and units of measurement.
Types of Measurements
Length, volume, and weight (or mass) can be measured in either the U.S. customary system or the metric system. It is important to know the U.S. customary measurements.
U.S. Customary Measurements
- Units of Length
- 12 inches (in) = 1 foot (ft)
- 3 feet = 36 inches = 1 yard (yd)
- 5,280 feet = 1,760 yards = 1 mile (mi)
- Units of Volume
- 8 ounces* (oz) = 1 cup (c)
- 2 cups = 16 ounces = 1 pint (pt)
- 2 pints = 4 cups = 32 ounces = 1 quart (qt)
- 4 quarts = 8 pints = 16 cups = 128 ounces = 1 gallon (gal)
- Units of Weight
- 16 ounces* (oz) = 1 pound (lb)
- 2,000 pounds = 1 ton (T)
- *Notice that ounces are used to measure the dimensions of both volume and weight.
The metric system is an international system of measurement also called the decimal system. The unit of length is a meter. The unit of capacity is a liter. The unit of mass is a gram.
Prefixes are attached to the basic metric units to indicate the amount of each unit. For example, the prefix deci means one-tenth (); therefore, one decigram is one-tenth of a gram, and one decimeter is one-tenth of a meter. The following six prefixes can be used with every metric unit:
So, for example:
- 1 meter is equivalent to 100 centimeters, or 1,000 millimeters.
- 1 gram is equivalent to 1,000 milligrams, or kilogram.
- 1 liter is equivalent to 1,000 millititers, or kiloliter.
One way to remember the metric prefixes is to remember the mnemonic: King Henry Died Of Drinking Chocolate Milk. The first letter of each word represents a corresponding metric heading from kilo down to milli: King—Kilo, Henry—Hecto, Died—Deka, Of—Original Unit, Drinking—Deci, Chocolate—Centi, and Milk—Milli.
- Units of Time
- 60 seconds (sec) = 1 minute (min)
- 60 minute = 1 hour (hr)
- 24 hours = 1 day
- 7 days = 1 week
- 52 weeks = 1 year (yr)
- 12 months = 1 year
- 365 days = 1 year
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