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Printable 1st grade worksheet on the un- prefix with fill-in-the-blank exercises for words like unhappy, undone, and unopen.
Worksheet

Prefix "Un-"

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This printable vocabulary worksheet teaches 1st graders the prefix \"un-\" with seven fill-in-the-blank exercises. Students add the prefix to base words and write the meaning of the new word, working with words like unhappy, undone, and unopen. Suitable for phonics practice, vocabulary building, or as a quick introductory activity on how prefixes change word meaning.

Subject:
English / Language Arts
Topic:
Vocabulary
Grade Level:
1st Grade
Updated July 2026

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