Understanding the Prefix 'Un-'
This worksheet helps third-grade students understand and use the prefix 'un-' to change the meaning of words.
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Understanding the Prefix 'Un-'
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Read the instructions for each section carefully and answer all questions.
The prefix 'un-' means 'not' or 'the opposite of'. When you add 'un-' to the beginning of a word, it changes the meaning of that word.
For example: happy → unhappy (not happy)
Add the prefix 'un-' to the word in the parentheses to complete each sentence.
1. The boy was (lucky) when he lost his favorite toy.
2. It was (kind) to take the last cookie without asking.
3. The knot in the rope was (tie).
4. The story had an (happy) ending.
5. Please (pack) your backpack after school.
Match the word with 'un-' to its meaning.
1. Unkind
a. Not safe
2. Unsafe
b. Not happy
3. Unhappy
c. Not kind
4. Unlock
d. To open a lock
1. Which word means 'not able'?
Able
Unable
Ableness
Ability
Write two sentences using words that begin with the prefix 'un-'. Circle the 'un-' words.
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