Prefixes Change What a Word Means
A cozy library workshop where Quill, a cheerful owl with a feathered quill pen tucked behind one ear, stands at a big chalkboard. She uses magnetic letter tiles to snap prefixes onto the front of root words, watching the meaning flip like a switch — then grins wide as the new word lights up.
- Explain what a prefix is and where it attaches to a word.
- Identify how adding un- changes a word to mean the opposite or 'not.'
- Identify how adding re- changes a word to mean doing something again.
- Predict the meaning of an unfamiliar word by recognizing its prefix.
- Compare two words that share a root but have different prefixes.
Key terms
- prefix
- a word part added to the front
- root word
- the base word before any change
- un-
- a prefix that means not
- re-
- a prefix that means again
Build With Prefixes
A prefix is a tiny word part you snap onto the front of a word. It is like clicking a new block onto a tower. When you add a prefix, the word gets a brand new meaning. The cool part is that prefixes work the same way every time. So once you learn one prefix, you can understand lots and lots of new words all by yourself.
Meet Un And Re
Two super helpful prefixes are un- and re-. The prefix un- means not or the opposite. So happy turns into unhappy, which means not happy. The prefix re- means again. So read turns into reread, which means read again. When you see a new word, look for these prefixes at the front. They give you a big clue about what the whole word means.
Worked examples
What does the word repaint mean
- Find the prefix at the front: re-.
- Remember re- means again.
- Add it to paint: paint again.
Answer: repaint means paint again
Activity
Drag the correct prefix tile onto each root word to match its meaning.
Practice
Add un- or re- to each root word to make a new word.
Match each new word to the meaning that fits it.
Common mistakes to avoid
- Un and re mean the sameUn- means not, but re- means again, so they are different.
Check your understanding
Your friend says she needs to 'repack' her backpack before the trip. What does repack most likely mean?
Which word means 'not lucky'?
A student thinks 'reread' and 'unread' mean the same thing because they both have the word 'read' in them. Is the student correct?
Recap
A prefix is a small word part you add to the front of a word to change its meaning. The prefix un- means not, and the prefix re- means again. Learn a prefix once and unlock many new words!
Reflect
What new word did you build with a prefix?