Prefixes & Suffixes (Intro) — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. Mom will preheat the oven before she bakes the cookies.
Preheat means to heat the oven before baking, since the prefix pre- means before.
2. The mittens keep my hands warm when it is unsafe safe to touch ice.
Unsafe means not safe, so touching ice without mittens can be unsafe in cold weather.
3. I missed the answer, so I will reread the question.
Reread means read again. Re- plus read makes a word for reading one more time.
4. We watched a preview of the movie before it came out.
A preview is a view that happens before the full movie, showing a small part first.
5. My little brother was unhappy because he lost his toy.
Unhappy means not happy. Losing a toy can make someone feel sad or unhappy.
6. Please redo your work if the first try had mistakes.
Redo means to do the work again. Re- plus do builds this new word.
7. It is unsafe to run near the pool because the floor is slippery.
Unsafe means not safe. A slippery floor makes running near a pool not safe.
8. Our teacher will reread the story we read yesterday.
Reread means to read again. The teacher will read the story one more time today.
9. Please reheat the soup so it is warm when we sit down.
Reheat means to heat again. Re- attaches to heat to make a word for warming food a second time.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
un-
→ not or opposite
not or opposite
re-
→ again
again
pre-
→ before
before
unlock
→ to open, the opposite of lock
to open, the opposite of lock
Un- means not or opposite, re- means again, and pre- means before. Unlock joins un- with lock, giving the opposite of lock.