1Metric Measurement
Some questions on the GED^{®} Mathematics Test require students to work with metric units of measurement. Although the metric system is used throughout the world, most GED students are not acquainted with it.
When they take the GED Mathematics Test, students may be confused when they see units that they do not know. The first step is to familiarize students with the basics of the metric system.
 Introduce students to the basic metric units of measure and related benchmarks to help them visualize the metric units.
 Present the key metric unit prefixes that they will need to know to work with metrics.
This lesson features basic metric units for length, weight, and volume. It also introduces the prefixes of kilo, centi, and milli and their relationship to multiples of 10.
2Common Units of Metric Measurement
The metric system has three basic units of measurement. The meter is used to measure length, the gram is used to measure weight, and the liter is used to measure volume.
Study the benchmarks below to to gain an understanding of the size of these units.
 Meter (m) a little more than a yard; a long stride
 Gram (g) the weight of a paper clip
 Liter (L) half of a 2liter bottle of soft drink
Question Anna wants to express the distance from goal to goal on a soccer field. Which unit of measurement should she use?
Step 1 Decide which category of measurement to use  length, weight, or volume.
You should use the category "length" to find the distance from goal to goal on a soccer field.
Step 2 Choose the metric unit that is used to measure length.
The meter is the metric unit used to measure length.
Answer meter
3Converting Units
Watch the video for an introduction to metric prefixes before working the problem.
Metric Units and Prefixes
Video: 1m 31s
You can use the basic metric units of measure to make larger and smaller units by multiplying and dividing by 10, 100, and 1,000. You can form the names for other units by adding prefixes to the beginning of the basic units.
Study the examples in the chart to see how prefixes are used.
Question James says that the book he is reading weighs about 1,000 grams. How could he express 1,000 grams in another metric form?
Step 1 How would he choose which metric prefix to use?
He would evaluate the meaning of milli, centi, and kilo to choose the correct prefix.
Step 2 Choose the prefix kilo, which means 1,000, since the book is almost 1,000 grams.
James could express the weight as either 1,000 grams or 1 kilogram because they mean the same thing.
Answer James could say that the book weighs about 1 kilogram.
4Sample GED Questions
Directions: There are two questions on this page. Each will appear in the blue rectangle below. Click on Question 1 to see the first question, and then select your answer. Click on Question 2 to see the second question, and select your answer. As you solve these problems, consider how you would work through them with your students.
Click for more teaching ideas.
How could you help students choose metric units and apply the metric prefixes correctly?
5Skill Review
Measurement: Lesson 3  Metric Measurement
Document
Printable Resource
In this lesson you have learned about metric measurement. This review consists of key terms and concepts with which you will need to be familiar. Click the view button on the left to access a review sheet.
Below you will also see a Classroom Connection with suggestions for linking this geometry content with your instruction.
Return to the GED Online Professional Development Course.
Credits
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Producer/Director: Vince Spoelker
Editor: Jim Piston
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Flash programming by Brian Vincent
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Metric Measurement is the third of five selfpaced lessons in the “Measurement” section. This lesson features basic metric units for length, weight, and volume ...
Metric Measurement is the third of five selfpaced lessons in the “Measurement” section. This lesson features basic metric units for length, weight, and volume. It also introduces the prefixes of kilo, centi, and milli and their relationship to multiples of 10. KET’s GED^{®} Geometry Professional Development Online Course is designed to help you review and build your skills and knowledge of geometry concepts and to help you to gain confidence in preparing your learners for a substantial portion of the GED Mathematics Test. Click on the view button on the left to begin Lesson 3.
Benchmarks for Science Literacy

11 (Grades: 912 ): Common Themes

11A (Grades: 912 ): Systems

11A/H1 (Grades: 912 ): A system usually has some properties that are different from those of its parts, but appear because of the interaction of those parts.

11A/H1 (Grades: 912 ): A system usually has some properties that are different from those of its parts, but appear because of the interaction of those parts.

11B (Grades: 912 ): Models

11B/H1a (Grades: 912 ): A mathematical model uses rules and relationships to describe and predict objects and events in the real world.

11B/H1a (Grades: 912 ): A mathematical model uses rules and relationships to describe and predict objects and events in the real world.

11C (Grades: 912 ): Constancy and Change

11C/H1 (Grades: 912 ): If a system in equilibrium is disturbed, it may return to a very similar state of equilibrium, or it may undergo a radical change until the system achieves a new state of equilibrium with very different conditions, or it may fail to achieve any type of equilibrium.

11C/H1 (Grades: 912 ): If a system in equilibrium is disturbed, it may return to a very similar state of equilibrium, or it may undergo a radical change until the system achieves a new state of equilibrium with very different conditions, or it may fail to achieve any type of equilibrium.

11D (Grades: 912 ): Scale

11A (Grades: 912 ): Systems

12 (Grades: 912 ): Habits of Mind

12A (Grades: 912 ): Values and Attitudes

12A/H1 (Grades: 912 ): Exhibit traits such as curiosity, honesty, openness, and skepticism when making investigations, and value those traits in others.

12A/H1 (Grades: 912 ): Exhibit traits such as curiosity, honesty, openness, and skepticism when making investigations, and value those traits in others.

12B (Grades: 912 ): Computation and Estimation

12A (Grades: 912 ): Values and Attitudes

9 (Grades: 912 ): The Mathematical World

9A (Grades: 912 ): Numbers

9A (Grades: 912 ): Numbers
NSTA National Science Education Standards

3 (Grades: K12 ): Constancy, change, and measurement