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Free 1st Grade Adding un-: Happy to Unhappy Worksheet

Adding un- to the front of a word changes its meaning: happy becomes unhappy (not happy) and lock becomes unlock (the opposite of lock). Children add un- to make new words, choose what an un- word means and pick the right un- word to finish a sentence. Learning how un- works helps children read and understand many new words.

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Grade
1st Grade
Subject
English
Topic
Vocabulary
Difficulty
Getting started
Estimated time
12 minutes
Curriculum
Texas grade levels (TEKS)
Questions
11
Answers
Included, with working
Format
PDF (A4), print or complete online

Students will practice

  • adding un- to the start of a word
  • knowing that un- means not or the opposite
  • using un- words in a sentence

Curriculum: Texas grade levels (TEKS). We show specific outcome codes only where they have been verified against the official curriculum document.

What's next?

Completed: Adding un-: Happy to Unhappy

  1. 11st Grade Alphabetical Order Worksheet — Level 1
  2. 21st Grade Compound Words Worksheet — Level 1
  3. 31st Grade Synonyms and Antonyms Worksheet — Level 1
  4. 41st Grade Compound Words Worksheet — Level 1 (Set 2)

How to use this worksheet

  1. Print the PDF or complete it on screen. Write the student's name and date at the top.
  2. Read the instructions for each part together before starting. Encourage working to be shown.
  3. Mark with the answer sheet. Use the model answers and success criteria as a guide rather than a single right answer.
  4. Record the score, celebrate what went well, then follow the "What's next" suggestion.

Common questions

Who is this worksheet for?

1st Grade students (typically ages 6–7) working on vocabulary. It is pitched at getting started; a harder version is linked above.

Are the answers included?

Yes. The PDF includes a full answer sheet with model answers and success criteria where there is more than one good answer. You can also view the answers online.

How long does it take?

About 12 minutes for 11 questions. Short, regular sessions work best: two or three a week beats one long one.

Do I need to sign up to download?

No. Click Download Free PDF and it opens immediately. It is free for personal, classroom and homeschool use.

What should we do next?

Try 1st Grade Alphabetical Order Worksheet — Level 1.

Preview

Success TutoringWorksheets1st Grade · English · Vocabulary

Adding un-: Happy to Unhappy

Name

Date

Score /

un- at the start of a word can mean not, or it can undo something.

Part A: Add un-

Put un in front of the word. Write the new word.

1.un + happy = (answer space)
2.un + lock = (answer space)
3.un + kind = (answer space)
4.un + pack = (answer space)

Part B: What does it mean?

Circle what the word means.

5.unhappy means…
  1. Avery happy
  2. Bnot happy
  3. Chappy again
6.unsafe means…
  1. Anot safe
  2. Bvery safe
  3. Csafe again
7.untie means…
  1. Atie it tight
  2. Btie it again
  3. Cundo the tie

Part C: Finish the sentence

Circle the un- word that makes sense.

8.Please (answer space) the door with the key.
  1. Aunkind
  2. Bunlock
  3. Cunpack
9.It is (answer space) to hit.
  1. Aunkind
  2. Buntie
  3. Cunlock
10.I (answer space) my bag after the trip.
  1. Aunsafe
  2. Bunhappy
  3. Cunpack
Free worksheets at worksheets.successtutoring.com · © Success Tutoring · Free for personal and classroom use

Preview — the PDF contains the full resource and answer sheet.

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Vocabulary in other year levels

About this resource

Created by
Success Tutoring
Last reviewed
1 October 2026
How it was made
Written by our team

Free to print and share for personal, classroom and homeschool use. Please don't resell. Spotted an error? Let us know.