 Praxis Elementary Education Exam—Forms of Measurement - dummies

# Praxis Elementary Education Exam—Forms of Measurement

The Math and Science sections of the Praxis Elementary Education exam contain questions where you will need to be familiar with different forms of measurement.

Measurements can be described in various types of units. English system units for distance include inches, feet, yards, and miles. They are based on each other. A foot is 12 inches, a yard is three feet, and a mile is 5,280 feet. Area measurements are given in those units squared, or to the second power (having an exponent of 2), and volume can be given in those units cubed (to the third power) or in another subsystem of English units based on the cup. A cup is about the size of a small drink that goes in the type of object called a cup, a pint is two cups, a quart is two pints, and a gallon is four quarts.

The metric system’s basic unit for distance is the meter, and other distance units are based on the meter. For example, a centimeter is one-hundredth of a meter, and a kilometer is 1,000 meters. Those are one-dimensional measurements. Two-dimensional units are the squares of one-dimensional units. For example, a rectangle with a length of 5 centimeters (cm) and a width of 2 cm would have an area of 10 cm2. Volume often involves the same kinds of distance units with an exponent of 3 because volume is three-dimensional. However, the metric system also uses the liter for measures of volume. One liter is equal to 1,000 cm3. The table lists metric prefixes. ## Practice question

1. 285.496 decameters is equal to how many centimeters?
A. 0.285496
B. 28.5496
C. 28,549.6
D. 285,496  