Metric Measurement is the third of five self-paced 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.

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.

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.

How could you help students choose metric units and apply the metric prefixes correctly?

5Skill Review

Measurement: Lesson 3 - Metric Measurement

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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.

Head Start Child Development and Early Learning Framework

5.2 ( Prekindergarten ): Orders objects by size or length.

Benchmarks for Science Literacy

11D/H1 ( Grades: 9-12 ): Representing very large or very small numbers in terms of powers of ten makes it easier to perform calculations using those numbers.

12B/E9 ( Grades: 3-5 ): Use appropriate units when describing quantities.

12B/H6 ( Grades: 9-12 ): When describing and comparing very small and very large quantities, express them using powers-of-ten notation.

12B/M11 ( Grades: 6-8 ): Use powers of ten when estimating the result of a calculation.

12B/M7a ( Grades: 6-8 ): Use the units of the inputs to a calculation to determine what units (such as seconds, square inches, or dollars per tankful) should be used in expressing an answer.

12B/M7b ( Grades: 6-8 ): Convert quantities expressed in one unit of measurement into another unit of measurement when necessary to solve a real-world problem.

12B/M9 ( Grades: 6-8 ): Express numbers like 100, 1,000, and 1,000,000 as powers of ten.

9A/H1 ( Grades: 9-12 ): Comparison of numbers of very different size can be made approximately by expressing them as nearest powers of ten.

NSTA National Science Education Standards

3.4 ( Grades: K-12 ): Different systems of measurement are used for different purposes. Scientists usually use the metric system. An important part of measurement is knowing when to use which system. For example, a meteorologist might use degrees Fahrenheit when reporting the weather to the public, but in writing scientific reports, the meteorologist would use degrees Celsius.

CCSS.Math.Cont.4.MD.A.1 ( Grade 4 ): Know relative sizes of measurement units within one system of units including km, m, cm; kg, g; lb, oz.; l, ml; hr, min, sec. Within a single system of measurement, express measurements in a larger unit in terms of a smaller unit. Record measurement equivalents in a two-column table.

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