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Common Core ELA3rd GradeLanguage

L.3.4: Figure Out Unknown Words

Also written as CCSS.ELA-LITERACY.L.3.4 · Cluster: Vocabulary Acquisition and Use.

Make a Vocabulary WorksheetAll 42 3rd Grade ELA Standards

The Official Wording

Determine or clarify the meaning of unknown and multiple-meaning word and phrases based on grade 3 reading and content, choosing flexibly from a range of strategies.

Common Core State Standards, Grade 3, Language · Read it at the source · Checked October 14, 2026

What L.3.4 Means in Plain English

Third graders meeting an unknown word read the whole sentence for clues, look for a known word inside it, and add the meaning of a prefix or suffix: fear and fearless, view and preview. A known root helps too, like sign inside signal. A glossary or dictionary settles it.

Second graders (L.2.4) worked with prefixes like un- and re-, roots and compound words like birdhouse. Third grade adds suffixes, chooses among the strategies flexibly, and uses a glossary for the exact meaning. Fourth grade (L.4.4) adds Greek and Latin roots, like photo and graph.

L.3.4 I Can Statements

  • I can use the words around an unknown word as clues.
  • I can use a prefix or suffix to change a word’s meaning.
  • I can check a glossary or dictionary for the exact meaning.

L.3.4 Worked Example

One unfamiliar word in a sentence from a nature story, two attempts at it, and the strong one uses two strategies that agree.

Prompt

What does harmless mean in this sentence? “When Callum lifted the flat rock, a salamander wiggled out, but his aunt told him not to worry, because it was harmless.”

Not YetHarmless means dangerous, because Callum was worried.The student grabbed one nearby word, worry, and missed the not in front of it. The word parts were never checked, so the guess points the wrong way.
Meets the StandardHarm means to hurt, and -less means without, like in fearless. So harmless means it can’t hurt you. That fits the sentence: his aunt told Callum not to worry because the salamander was safe to be near.The student splits the word into a known word and a known suffix, then checks that meaning against the whole sentence. Two strategies, one answer.
Moves to Use
Read the whole sentence and look for clue words, like not to worry.Find the word you know inside the new one: harm in harmless.Add the meaning of the affix: -less means without, pre- means before.Use a word with the same root: sign helps with signal.Check the glossary or a dictionary when the clues disagree.

Common Mistakes with L.3.4

Mixing up what a prefix does

“Preheat means really hot.”

Try this: Keep an affix chart (pre- before, re- again, dis- not, -less without) and test each new word against it.

Taking the first meaning of a multiple-meaning word

“The batter stepped up to the plate,” read as a dinner plate

Try this: Have students read every dictionary meaning, then pick the one that makes sense when put back in the sentence.

Splitting words that aren’t built from parts

“Carpet means a pet that rides in a car.”

Try this: Have students check the split against the sentence: if car plus pet makes no sense there, the word isn’t built from parts.

Where L.3.4 Fits

Comes BeforeL.2.4Use prefixes like un- and re-, root words and compound words to work out meanings.
AlongsideRI.3.4Determine the meaning of academic and subject words in a grade 3 text.RF.3.3Know the meaning of the most common prefixes and suffixes when decoding.
Comes NextL.4.4Use Greek and Latin affixes and roots, and reference materials, to work out meanings.

Practice L.3.4

Vocabulary Worksheet GeneratorFree ToolLoad a list of -less, -ful and pre- words (fearless, careful, preview) and have students write a definition and a sentence for each.PrefixesSuffixesDefinitions
Make a Worksheet

Quick Check

  1. What two strategies does the strong answer use to work out harmless?
  2. If -less means without, what does fearless mean?
  3. Use the prefix pre- to explain what preview means.

L.3.4: Other Names

L.3.4CCSS.ELA-LITERACY.L.3.4

Common Core State Standards © Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved. Official wording from the Common Core State Standards PDFs at corestandards.org, last checked October 14, 2026. The explanation, I can statements, example, mistakes and practice on this page are EMStudio’s own, written beside the official wording. They are not part of the standard.