Measuring Up: Should the U.S. Go Metric? — Free Printable (Grade 8)

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Measuring Up: Should the U.S. Go Metric?

Grade 8 W.8.1 2 Parts8 questions + essay

Standard: Write arguments to support claims with clear reasons and relevant evidence, acknowledging and distinguishing opposing claims using multiple sources.

Name:

Date:

Period:

How This Assessment Works

1. Read Sources → 2. Answer Part 1 → STOP → 3. Plan → 4. Write Part 2

This is a two-part performance task. Complete Part 1 in full before moving on to Part 2.
Read all 3 sources carefully. You may annotate, underline, or take notes in the margins.
Answer Part 1 questions using evidence from the sources. Always cite the source by title or number.
For Part 2, plan your essay in the organizer, then write your full argument on the lines provided.
Use your own words except when quoting directly. Direct quotes should be in "quotation marks."
Part 1 is worth 30% of your score. Part 2 is worth 70%.

Sources to Read

1 In nearly every country on Earth, a student measuring the length of a table would express the answer in centimeters or meters. A chemist recording the mass of a compound would use grams or kilograms. A road sign indicating the distance to the next city would show kilometers. The metric system — formally known as the International System of Units, or SI — is the standard language of measurement for virtually the entire world. Only three countries have not officially adopted it: the United States, Liberia, and Myanmar.

2 The metric system was born during the French Revolution in the 1790s, when French scientists sought to replace the chaotic patchwork of local measurement systems that made trade and communication difficult across Europe. Their goal was elegantly simple: create a system based on the number ten, where every unit relates to every other unit by powers of ten. A kilometer is 1,000 meters. A kilogram is 1,000 grams. A liter of water at its densest temperature has a mass of exactly one kilogram. This internal consistency makes conversions effortless — no memorizing that there are 5,280 feet in a mile, 16 ounces in a pound, or 128 fluid ounces in a gallon.

3 By the mid-twentieth century, the metric system had become the foundation of international science and commerce. Scientists worldwide use metric units because precision demands a shared language. When a physicist in Japan publishes a finding measured in joules and meters, a physicist in Brazil can immediately replicate the experiment without converting between incompatible systems. International trade similarly depends on metric standardization. Shipping containers, manufacturing specifications, and trade agreements all use metric units, allowing goods to flow smoothly between countries.

4 The pharmaceutical industry provides a striking example of why precision in measurement matters. Drug dosages are calculated in milligrams per kilogram of body weight. Medical devices are manufactured to metric tolerances measured in micrometers. When every hospital, pharmacy, and manufacturer uses the same units, the risk of dangerous dosing errors decreases significantly. In countries that use metric measurements exclusively, medical professionals rarely face the confusion of converting between systems.

5 Proponents of metric adoption argue that the United States pays a hidden cost for its resistance to the global standard. American manufacturers who export goods must maintain two sets of tools, measurements, and documentation — one for the domestic market and one for international customers. Students who learn the customary system must then relearn measurement in metric units when they take science courses, creating an unnecessary cognitive burden. Advocates say that joining the rest of the world would simplify education, reduce errors, and strengthen American competitiveness in the global economy.

6 "The metric system is not just a different way of measuring," explains Dr. Lorraine Patterson, a metrologist who studies measurement science. "It is a fundamentally better system — more logical, more consistent, and more universally understood. The question is not whether the metric system is superior. The question is whether the cost of switching is worth the long-term benefits."

1 The United States has considered adopting the metric system many times over the past two centuries, and each time, the effort has stalled. Understanding why requires looking at a history shaped by politics, economics, and deeply rooted cultural habits.

2 As early as the 1790s, Thomas Jefferson proposed a decimal-based measurement system for the young nation. His plan was never adopted, partly because the French metric system was still being developed and partly because Congress saw no urgent need to replace the English customary units already in use. In 1866, Congress passed the Metric Act, which made it legal — but not mandatory — to use metric units in the United States. The law had little practical effect. Americans continued measuring in inches, pounds, and gallons, as they always had.

3 The most ambitious push came in 1975, when President Gerald Ford signed the Metric Conversion Act. The law declared that the metric system was "the preferred system of weights and measures for United States trade and commerce" and established the U.S. Metric Board to coordinate a voluntary transition. The key word was "voluntary." Without a mandate, industries and citizens were free to ignore the effort entirely — and most did. The Metric Board was disbanded in 1982 under President Reagan after accomplishing little, and the conversion movement lost momentum.

4 A partial revival came in 1988 with the Omnibus Trade and Competitiveness Act, which required federal agencies to use metric units in procurement and business activities. Federal highway signs were briefly considered for metric conversion, but pilot programs in several states met fierce public opposition. Drivers accustomed to miles-per-hour speed limits and mile-marker exits resisted the change. The highway conversion was quietly abandoned.

5 The costs of switching have always been a central argument against conversion. Replacing road signs across the country would cost an estimated several billion dollars. Retooling factories to produce metric-sized products would require enormous capital investment. Every wrench, socket set, and measuring cup in American homes would gradually need replacement. Small businesses — auto repair shops, construction companies, hardware stores — would face the burden of maintaining both metric and customary tools during a long transition period.

6 Cultural resistance runs even deeper than economic concerns. For many Americans, the customary system feels intuitive in a way that metric units do not. A person can visualize a foot because it is roughly the length of a human foot. A cup of flour is a tangible quantity in a kitchen. A mile is the distance that generations of Americans have driven, walked, and run. Critics of metrication argue that forcing people to abandon familiar units in their daily lives would create confusion and resentment without meaningful benefit for ordinary citizens.

7 "People don't resist the metric system because they think it's a bad system," observes Dr. James Henderson, a cultural historian who has studied American metrication efforts. "They resist it because they don't see why they should change something that works perfectly well for them. The benefits of conversion are mostly abstract and long-term, while the costs and inconvenience are immediate and personal."

1 On September 23, 1999, NASA's Mars Climate Orbiter — a spacecraft that had traveled over 400 million miles — disintegrated in the Martian atmosphere. The cause was staggeringly simple: one engineering team had used metric units while another had used customary units, and no one caught the mismatch. The thrust data, calculated in pound-force by the spacecraft's manufacturer, was read as newtons by NASA's navigation team. The resulting error sent the orbiter too close to Mars, destroying a mission that had cost over 125 million dollars.

2 The Mars Climate Orbiter disaster is the most famous example of what happens when two measurement systems collide, but it is far from the only one. In 1983, an Air Canada Boeing 767 — later nicknamed the "Gimli Glider" — ran out of fuel mid-flight because ground crews confused kilograms and pounds when calculating how much fuel to load. The pilots managed to glide the plane to a safe emergency landing, but the incident demonstrated how dangerous unit confusion can be in aviation.

3 In everyday American life, the two-system problem creates a steady stream of smaller but significant complications. Medical professionals in the United States must constantly convert between systems. A patient's weight might be recorded in pounds at the doctor's office but drug dosages are calculated in milligrams per kilogram. Conversion errors in medical settings have led to documented cases of incorrect dosing, though modern electronic health records have added safeguards to reduce this risk.

4 The construction and manufacturing industries face their own challenges. American builders typically work in feet and inches, but many building materials — especially those imported from overseas — are manufactured in metric dimensions. Plywood sheets, steel beams, and electronic components often require careful conversion, and even small rounding errors can compound across a large project. Machinists who work with international clients must maintain two complete sets of precision tools, one metric and one customary, at considerable expense.

5 Supporters of metric conversion point to these real-world costs and risks as evidence that the United States can no longer afford to remain an outlier. They argue that as the global economy becomes more interconnected, the friction caused by maintaining a separate measurement system will only grow. American students who pursue careers in science, engineering, or international business must already learn the metric system; full national adoption, advocates say, would simply align daily life with professional practice.

6 Opponents counter that the practical risks of the two-system problem, while real, are manageable. They note that industries where precision is critical — such as aerospace, pharmaceuticals, and scientific research — already use metric units internally. The customary system, they argue, serves everyday domestic purposes perfectly well. Forcing a national conversion would impose enormous costs on ordinary citizens and small businesses to solve a problem that mainly affects specialized industries.

7 "The real question isn't whether the metric system is better in the abstract," argues columnist Robert Kinsey, who has written extensively about the metrication debate. "The question is whether the disruption of converting 330 million people's daily habits is justified by the benefits. Every country that has switched did so decades ago, when the economic cost was a fraction of what it would be today. America may have simply waited too long."

Part 1 · Reading & Research

Worth 30% of your overall score. Answer every question using the sources above.

1 Multiple Choice 1 pt

According to Source 1, what is the primary advantage of the metric system's design?

Reference: Source 1

A. It was invented by the most powerful country in Europe.

B. It is based on the number ten, making conversions between units effortless.

C. It uses units that are based on the size of the human body.

D. It was designed specifically for scientific research.

Answer Key Correct: B

2 Multiple Choice 1 pt

What happened when the Metric Conversion Act of 1975 was implemented?

Reference: Source 2

A. All American road signs were converted to kilometers within five years.

B. The metric system became mandatory for all U.S. businesses.

C. The transition was voluntary, so most industries and citizens ignored it.

D. American manufacturers immediately adopted metric tools.

Answer Key Correct: C

3 Multiple Choice 1 pt

What caused the destruction of NASA's Mars Climate Orbiter in 1999?

Reference: Source 3

A. A software virus corrupted the navigation system.

B. The spacecraft ran out of fuel before reaching Mars.

C. One team used metric units and another used customary units, and the mismatch went undetected.

D. The spacecraft was struck by debris in the Martian atmosphere.

Answer Key Correct: C

4 Multiple Choice 1 pt

According to Source 2, why does cultural resistance to the metric system run deeper than economic concerns?

Reference: Source 2

A. Americans believe the metric system is scientifically inaccurate.

B. The customary system feels intuitive because it connects to familiar, everyday experiences.

C. American schools have always taught that the customary system is superior.

D. Most Americans have never heard of the metric system.

Answer Key Correct: B

5 Multiple Choice 1 pt

Which argument do opponents of metric conversion make in Source 3?

Reference: Source 3

A. The metric system has been proven inferior for scientific work.

B. The Mars Climate Orbiter disaster was not actually caused by a unit mismatch.

C. Industries where precision is critical already use metric units, so national conversion is unnecessary.

D. The United States should develop its own new measurement system.

Answer Key Correct: C

6 Multiple Choice 1 pt

Which idea is developed across all three sources?

Reference: All Sources

A. The United States should immediately mandate metric conversion by federal law.

B. The metric system is only useful for scientists and engineers.

C. The debate over U.S. metric adoption involves a tension between long-term benefits and short-term costs.

D. Every previous attempt to adopt the metric system has made the problem worse.

Answer Key Correct: C

7 Written Response 2 pts

Source 1 describes the advantages of the metric system, while Source 2 explains why
the United States has repeatedly failed to adopt it. How do these two sources together
help explain the gap between what experts recommend and what actually happens in
national policy? Use specific evidence from both sources in your answer.

Target: 50-200 words

Scoring Rubric

2Response clearly explains the gap between expert recommendation and policy outcome with specific, accurately cited evidence from both sources.

1Response addresses the gap but evidence is limited to one source or the explanation is incomplete.

0Response does not address the question, lacks evidence, or contains significant inaccuracies.

8 Written Response 2 pts

In Source 3, columnist Robert Kinsey argues that "America may have simply waited too
long" to switch to the metric system. Do the examples and evidence presented across the
sources support or weaken this claim? Use evidence from Source 3 and at least one other
source to explain your reasoning.

Target: 50-200 words

Scoring Rubric

2Response evaluates Kinsey's claim with clear reasoning and specific evidence from Source 3 plus at least one other source.

1Response addresses the claim but reasoning is underdeveloped or evidence comes from only one source.

0Response does not address the question or lacks evidence from the sources.

✋

STOP

Review your Part 1 answers above before continuing to Part 2.
Once you begin writing your essay, do not change your Part 1 answers.

Part 2 · Argumentative Essay

Worth 70% of your overall score. Plan your writing first, then draft your full response on the lines provided.

Writing Task

The three sources you read present different perspectives on whether the United States
should officially adopt the metric system. Source 1 examines the history and advantages
of the metric system as a global standard. Source 2 explores the United States' repeated
failed attempts at conversion and why they stalled. Source 3 looks at the real-world
consequences of operating with two measurement systems.

Should the United States officially switch to the metric system? Some argue that adopting
the global standard would reduce costly errors, strengthen international competitiveness,
and simplify education. Others contend that the enormous expense, public resistance, and
disruption to everyday life make conversion impractical. Write an argumentative essay in
which you take a clear position on this question. Distinguish your claim from opposing or
alternate claims, and use evidence from at least two of the three sources to support your
argument while acknowledging and addressing counterclaims.

Things to Think About

What are the strongest arguments for metric adoption, and what evidence supports them?
What are the strongest arguments against conversion, and how would you respond to them?
How do real-world consequences — from NASA missions to medical dosing — affect your position?
What would someone who disagrees with your position argue, and why is your position stronger?

Plan Your Essay

Use this organizer to plan your essay before you write. The planner is optional but helps you organize your thinking.

ClaimMy position

Evidence from Source #1Quote or paraphrase + page/line

Evidence from Source #2Quote or paraphrase + page/line

Evidence from Source #3Quote or paraphrase + page/line

CounterargumentWhat others might say & my response

ConclusionSo what? Why does it matter?

Write Your Essay

Target: about 500 words · Use evidence from more than one source. Cite each source by title or number.

Vocabulary Bank

Word	Definition
metrication	The process of adopting the metric system as a country's official system of measurement
customary system	The system of measurement used in the United States, based on inches, pounds, and gallons
standardization	The process of establishing uniform rules, units, or practices to ensure consistency
conversion	The act of changing from one system, unit, or form to another
procurement	The process of obtaining goods, services, or supplies, especially for a government or organization
metrologist	A scientist who studies the science of measurement and measurement systems

Scoring Rubric — Part 2 Essay

Criteria	●●●● 4 — Exceeds	●●●○ 3 — Meets	●●○○ 2 — Approaches	●○○○ 1 — Below
Organization & Purpose	Clear thesis, logical sequence, effective transitions, strong intro and conclusion	Clear claim with adequate organization and acknowledged counterargument	Some structure but claim is unclear or organization is weak	No clear claim or off-topic
Evidence & Elaboration	Multiple sources cited accurately with thoughtful explanation of how each supports the claim	Uses evidence from more than one source, named by title or number, with basic explanation	Evidence from only one source, or sources used without explanation	Little or no source evidence; copied or paraphrased without citation
Conventions	Few errors, varied sentence structure, precise vocabulary	Errors do not interfere with meaning; complete sentences	Some errors that occasionally interfere with meaning	Frequent errors interfere with meaning

Self-Check Before You Submit

I read all sources carefully before answering Part 1

I answered every Part 1 question in my own words

My essay has a clear thesis or controlling idea about argument

I used evidence from MORE THAN ONE source in my essay

I named each source by title or number when I cited evidence

I explained how each piece of evidence supports my thesis

I addressed a counterargument and explained why my position is stronger

I used my own words except when quoting directly

I re-read my draft and fixed spelling/punctuation/capitalization errors

Notes & Scratch Work

Use this space for brainstorming, vocabulary you want to use, sentence drafts, or anything else that helps you think through your writing.

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