Prefixes & Suffixes (Intro) — Answer Key
Part A: Sort the Words
Sort each word or number into the correct category box.
1. Sort each word by where the extra letters are added.
Has Prefix
unlockredounsafe Has Suffix
helpfulslowlycareless Prefixes like un- and re- are added to the beginning of a word. Suffixes like -ful, -ly, and -less are added to the end. Check where the extra letters sit.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. The prefix un- means not.
Un- is a prefix that means not or the opposite, so unkind means not kind.
2. The suffix -ful means full of.
The ending -ful tells us the base word is full of something, like helpful meaning full of help.
3. The prefix re- means again.
Re- is a prefix that means to do something again, so replay means play again.
4. A prefix is added to the beginning of a word.
Prefixes always attach to the start of the base word, which changes the word's meaning right away.
5. A suffix is added to the end of a word.
Suffixes always attach to the end of the base word and can change the meaning or job.
Part C: True or False?
Read each statement. Circle True or False.
1. The word unlock has the prefix un-.
True False
Un- sits at the beginning of unlock, and the base word is lock, so un- is the prefix.
2. The suffix -ful means without.
True False
The suffix -ful means full of, not without. The suffix that means without is -less.
3. Helpful is made of help plus the suffix -ful.
True False
Help is the base word, and -ful is added to the end, so helpful means full of help.
4. A prefix is added to the end of a word.
True False
A prefix is added to the beginning of a word, not the end. A suffix is added to the end.