3rd Grade Prefixes Worksheets
Third graders use prefixes as meaning clues: if tie becomes untie and read becomes reread, then an unfamiliar word like miscount can be reasoned out instead of skipped. This grade adds trickier pairs where more than one prefix makes a real word and only context settles it.
Free printable PDF, aligned to Common Core L.3.4.b. One skill per page, answer key on page two.
Every sheet is one of a kind and prints with a version code, so you can reprint the exact same one later. New version every click.
The kind of sentences you'll get
Circle the letter of the word with the correct prefix.
-
The twins are ______ at recess.
disseparable · unseparable · inseparable
Answer: inseparable
- Mom said the wobbly ladder was ______ to climb. resafe · unsafe · presafe
- Calling people names is an ______ thing to do. rekind · unkind · diskind
Every print draws a fresh mix of sentences at this level, so a make-up test or a second sibling gets a different sheet.
What's on each sheet
- Choose the word. Circle the letter of the word with the correct prefix. 10 questions per page.
Every version prints on US Letter or A4, with its answer key on the last page.
How to teach this
The interesting errors at this level come from real-word foils: both reheat and preheat exist, so the sentence has to be read, not skimmed. Make "what does the sentence need?" the routine question. A quick daily game, tossing out a base word and collecting every real prefixed form, builds the flexibility this grade demands.
Watch for: A prefix changes meaning, not spelling: the base word keeps all its letters (re + read = reread). Not every word that starts with those letters has a prefix. Uncle isn't un + cle.
Common questions about prefixes
- Why do some answer choices look like real words?
- Because they are. Reheat and preheat both exist, so the sentence decides: soup that went cold gets reheated, an oven gets preheated. Choosing between real words is the actual grade-3 skill, harder and more useful than spotting made-up ones.
- How do prefixes help with reading comprehension?
- They turn long words into solvable puzzles. A reader who knows mis- means wrongly can work out miscounted mid-sentence and keep going. That habit of splitting words into parts is one of the strongest predictors of vocabulary growth.
Related worksheets
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One page, answer key included. A fresh version every time you click.
Aligned to Common Core L.3.4.b. Reviewed by the One More Sheet curriculum team. Content version 68, updated July 2026.