English Language Arts
Grade 3
15 min
Abbreviate metric units of measurement
Abbreviate metric units of measurement
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1
Introduction & Learning Objectives
Learning Objectives
Identify the author's purpose for using metric abbreviations in a short text.
Define 'abbreviation' as a shorter way to write a word.
Match the metric units meter, liter, and gram with their correct abbreviations.
Explain why an author chooses an abbreviation to save space or make instructions clearer.
Correctly write a sentence using a metric abbreviation to achieve a clear purpose.
Differentiate between an author's purpose to inform and to instruct when metric units are used.
Have you ever seen a recipe that says 'add 50 mL of water'? 🤔 Why didn't the author write out the long word 'milliliters'?
Authors make choices to help their readers understand them. Today, we'll learn about a special choice: usin...
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Key Concepts & Vocabulary
TermDefinitionExample
Author's PurposeThe main reason an author decides to write something. The purpose is often to inform, instruct, or entertain.The author's purpose in a cookbook is to instruct you how to make food.
AbbreviationA short and simple way to write a longer word.The abbreviation for the word 'Mister' is 'Mr.'
Metric UnitA standard word used for measuring how long, heavy, or full something is.We use the metric unit 'gram' to measure the weight of a strawberry.
To InformAn author's purpose to give the reader facts and information about a topic.A science book that says 'An ant is about 5 mm long' is written to inform.
To InstructAn author's purpose to teach the reader how to do something, usually with step-by-step dire...
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Key Rules & Conventions
The Space-Saver Rule
Authors use abbreviations to fit words into small spaces.
Use this when writing in a chart, on a small label, or in a list where space is tight. It makes the text look neat and organized.
The No-Period Rule
Metric abbreviations do not need a period after them (unless it is the end of a sentence).
When an author writes about science or measurements, they follow this style rule. For example, they write 'The line is 10 cm long' not 'The line is 10 cm. long'.
The Singular Rule
The abbreviation stays the same for one or many.
An author writes '1 g' for one gram and '50 g' for fifty grams. They never add an 's' to the abbreviation, which keeps the writing consistent and professional.
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Challenging
An author writes a story set in the year 1750. A character says, "It is a 10 km walk to the next town." From an author's purpose perspective of creating a believable world, what is the main problem with this sentence?
A.The metric system and abbreviations like 'km' were not used in 1750, making the story feel unrealistic.
B.People in 1750 would not have walked that far in one day.
C.The abbreviation 'km' is too hard for a modern reader to understand.
D.The author should have used 'kilometers' to make the sentence longer.
Challenging
In a legal contract, a sentence reads, "The total weight of the shipment shall not exceed fifty kilograms (50 kg)." What is the author's purpose for writing the measurement in both full words and the abbreviation?
A.To make the document longer and more difficult to read.
B.To be extremely clear and prevent any possible misunderstanding or mistake.
C.To entertain the reader, who might be bored by the contract.
D.To test whether the reader knows that 'fifty' and '50' are the same.
Challenging
A medicine bottle for children says, "Dose: 5 mL." A group of parents argues that for the purpose of safety, it should say "5 milliliters" instead. What is the strongest reason this change would better fit the author's purpose?
A.Because 'milliliters' is a shorter word than 'mL'.
B.Because using the full word is more entertaining for the child.
C.Because some caregivers might not know 'mL', and the full word removes all possible confusion.
D.Because 'mL' is an abbreviation for a different measurement.
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