Prefix Power Slides Grade 3 Morphology Lab
Lesson 1: Front-End Fixes
Prefix Power!
Discover how small word parts at the beginning change the entire meaning of a base word.
1
Identify Base Words
2
Attach Prefixes
3
Decode New Meanings
The Foundation
What is a Base Word?
Root Foundation
A Standalone Word
A base word has meaning all by itself. It does not need any extra pieces to make sense!
"You can build around it, but the base word is always the core heart of the meaning."
pack to fill a suitcase or bag
read to look at and understand text
view to see or watch something
Turn & Talk: What other simple base words can you think of in 10 seconds?
Meet The Prefixes
Four Power Starters
Prefix = Before the Word
un-
Meaning: NOT or OPPOSITE
un + kind = unkind (not kind)
un + lock = unlock (opposite of lock)
re-
Meaning: AGAIN or BACK
re + play = replay (play again)
re + visit = revisit (visit again)
dis-
Meaning: NOT or AWAY
dis + like = dislike (to not like)
dis + agree = disagree (not agree)
pre-
Meaning: BEFORE
pre + view = preview (view before)
pre + heat = preheat (heat before)
Notice: The spelling of the base word never changes when adding these prefixes!
Word Surgery
Dissecting the New Word
Word Dissector
un- + wrap = unwrap
Opposite of wrap: to open a package
re- + build = rebuild
Build again after damage
pre- + pay = prepay
Pay for something before receiving it
Rule to remember: [ Prefix Meaning ] + [ Base Word Meaning ] = [ New Word Meaning ]
Quick Practice
Crack the Word Puzzle!
Whiteboard Challenge
Clue 1
"The magician made the coin vanish from sight."
Base word: appear
What word means "opposite of appear"?
disappear
Clue 2
"Maya wrote her paragraph one more time to fix errors."
Base word: write
What word means "write again"?
rewrite
Clue 3
"Coach gave us a warm-up session before the game began."
Base word: game
What word means "before the game"?
pregame
High five your partner when you get all three correct!
Independent Lab Work
Your Mission Today
Step-by-Step
1
Prefix Matching
Match the prefix to its correct meaning and combine it with given base words.
2
Word Dissection
Separate prefixed words into prefix + base word, then define what the word means.
3
Sentence Crafters
Use newly crafted prefix words in original, detailed complete sentences.
Exit Question:
If order means neat and organized, what does disorder mean?
Prefix Power Worksheet Word Crafters Lab • Lesson 1
Prefix Power Practice
Name:
Date:
Prefix Keys:
un- = not / opposite re- = again / back dis- = not / away pre- = before
1 Word Surgery: Break It Down
Separate each word into its prefix and base word, then define it.
Full Word
Prefix
Base Word
What does it mean?
Example: unkind
un-
kind
not kind; mean
1. replay
2. disagree
3. preheat
4. unlock
2 Word Builder: Assemble the Clues
Add the correct prefix to the base word in parentheses.
A. Mom had to the oven before baking cookies. (base: heat)
heat before
B. If you are not careful, you might your jacket. (base: place)
place wrongly / lose
C. Leo had to his laces when his shoe became untied. (base: tie)
tie again
D. It was of the puppy to knock over the trash can. (base: usual)
not usual / rare
Grade 3 Morphology Lab • Word Crafters Page 1 of 2
Word Crafters Lab • Lesson 1
Prefix Context & Writing
Name:
Word Bank for Part 3
rebuild preview disobey unhappy
3 Sentence Sleuth: Choose the Best Word
1. After the storm knocked over the tree fort, the children decided to it with stronger wood.
2. The movie theater showed an exciting five-minute of next summer's superhero film.
3. Good citizens follow safety rules and never the lifeguard at the pool.
4. Marcus was very when the rain ruined the outdoor picnic.
4 Prefix Detective: Find the Base Word
Read the sentence. Underline the prefix and write the original base word in the space.
"Dad had to restart the slow computer."
Base Word:
"We watched the rabbit disappear in the grass."
Base Word:
5 Writer's Workshop: Craft Your Own Sentences
Write a complete, detailed 3rd-grade sentence using each target prefixed word.
A. Target Word: unfair (meaning: not fair)
B. Target Word: repaint (meaning: paint again)
Grade 3 Morphology Lab • Word Crafters Page 2 of 2
Prefix Power Answer Key Teacher Reference • Lesson 1
Prefix Power Answer Key
Grade 3 Morphology
Part 1: Word Surgery Solutions 4 items
1. replay: re- + play
Meaning: to play again (video, game, sound)
2. disagree: dis- + agree
Meaning: to have a different opinion / not agree
3. preheat: pre- + heat
Meaning: to heat up before cooking
4. unlock: un- + lock
Meaning: to open a lock / opposite of lock
Part 2: Word Builder Solutions 4 items
A. (heat): preheat
B. (place): misplace / displace (accept misplace or displace)
C. (tie): retie
D. (usual): unusual
Part 3: Sentence Sleuth
Fort rebuild: rebuild
Movie teaser: preview
Lifeguard rules: disobey
Rain on picnic: unhappy
Part 4: Prefix Detective (Base Words)
restart → Base: start (prefix: re-)
disappear → Base: appear (prefix: dis-)
Part 5: Exemplar Student Sentences (Rubric: Complete sentence, capital letter, period, correct context)
unfair:
"It felt unfair when my older brother got two slices of cake and I only got one."
repaint:
"Grandpa bought bright red paint so we could repaint the old wooden birdhouse."
Common 3rd Grade Misconceptions ("Prefix Imposters")
Watch out for words that start with prefix letters but have no standalone base word! Remind students to always check if the remaining letters form a real English word.
uncle: Not a prefix ("cle" is not a word)
real: Not a prefix ("al" is not a word)
distance: Not a prefix ("tance" is not a word)
Grade 3 Morphology Lab • Word Crafters Lesson 1 Teacher Guide & Key
Suffix Switch Slides Grade 3 Morphology Lab
Lesson 2: Back-End Boosters
Suffix Switch!
Master word endings that change meaning, then combine prefixes, bases, and suffixes into mega words!
1
Learn 4 Suffixes
2
Switch Suffixes
3
Build 3-Part Words
The Ending Engine
What is a Suffix?
Attaches to the END
Added to the Caboose
A suffix is a letter or group of letters added to the end of a base word to change its meaning or how it is used.
"Prefix in front, base in the center, suffix at the tail!"
help + ful
helpful
help + less
helpless
help + er
helper
Notice how switching the suffix transforms the word's meaning in three completely different ways!
Suffix Catalog
Four Essential Word Enders
Look at the Ending
-ful
Meaning: FULL OF
cheer + ful = cheerful (full of cheer)
peace + ful = peaceful (full of peace)
-less
Meaning: WITHOUT
fear + less = fearless (without fear)
end + less = endless (without end)
-able
Meaning: ABLE TO BE
wash + able = washable (able to be washed)
adapt + able = adaptable (able to adapt)
-er
Meaning: PERSON WHO / ONE THAT
teach + er = teacher (person who teaches)
build + er = builder (person who builds)
Super Clue: -ful and -less are antonym (opposite) partners! careful ↔ careless
Interactive Lab
The Suffix Switchboard
Flip the Ending!
Base: thought
thoughtful
Thinking of others; kind
thoughtless
Not thinking; inconsiderate
Switch: -ful ↔ -less
Base: pain
painful
Full of hurt or ache
painless
Without any hurt
Switch: -ful ↔ -less
Base: play
playful
Full of fun and energy
player
One who plays a game
Switch: -ful ↔ -er
Changing the suffix completely transforms the story a word tells!
Suffix Switch Worksheet Word Crafters Lab • Lesson 2
Suffix Switch Practice
Name:
Date:
Suffix Keys:
-ful = full of -less = without -able = able to be -er = person who / one that
1 The Suffix Switchboard: Antonym Pairs
Add -ful and -less to the base word to build opposite meanings.
Base Word
Add -ful (Full of...)
Add -less (Without...)
Example: care
careful (full of care)
careless (without care)
1. help
2. cheer
3. pain
4. hope
2 Suffix Transformer: -able and -er
Combine the base word and suffix, then write its meaning.
A. wash + -able =
Meaning:
B. teach + -er =
Meaning:
C. break + -able =
Meaning:
D. sing + -er =
Meaning:
Grade 3 Morphology Lab • Word Crafters Page 1 of 2
Word Crafters Lab • Lesson 2
Mega Word Matrix: Prefix + Base + Suffix
Name:
3 Mega Word Assembly Matrix
Assemble all three parts into one complete mega word!
Prefix
Base Word
Suffix
Complete Mega Word
un-
help
-ful
re-
play
-able
dis-
respect
-ful
un-
break
-able
4 Context Challenge: Match the Mega Word
1. That thick rubber water bottle will never crack because it is virtually (clue: cannot be broken)
2. Giving the referee a mean look was very (clue: full of not showing respect)
3. Leaving your toys in the doorway was (clue: not full of help to others)
5 Master Crafter: Write Your Own Mega Sentences
Write complete sentences demonstrating that you understand each word's meaning.
A. Target Word: fearless (meaning: without any fear)
B. Target Word: reusable (meaning: able to be used again)
Grade 3 Morphology Lab • Word Crafters Page 2 of 2
Suffix Switch Answer Key Teacher Reference • Lesson 2
Suffix Switch Answer Key
Grade 3 Morphology
Part 1: Antonym Pairs Solutions 4 pairs
1. help: helpful / helpless
2. cheer: cheerful / cheerless
3. pain: painful / painless
4. hope: hopeful / hopeless
Part 2: Suffix Transformer 4 items
A. washable: able to be cleaned with water
B. teacher: person whose job is to teach
C. breakable: easy to damage or break
D. singer: one who performs or sings songs
Part 3: Mega Word Assembly Matrix
1. un + help + ful → unhelpful
2. re + play + able → replayable
3. dis + respect + ful → disrespectful
4. un + break + able → unbreakable
Part 4: Context Sentences
Rubber bottle: unbreakable
Mean look to referee: disrespectful
Leaving toys in doorway: unhelpful
Part 5: Exemplar Student Sentences (Rubric: Grammatically complete, correct meaning)
fearless:
"The fearless firefighter ran straight into the smoke to rescue the trapped kitten."
reusable:
"We brought our colorful reusable shopping bags to the grocery store to protect the environment."
Spelling Rule Teacher Alert (Suffixes with Vowels vs Consonants)
Consonant Suffixes (-ful, -less):
Usually keep silent e ! (e.g., hope → hopeful , care → careless ). No letter changes needed in base word.
Vowel Suffixes (-able, -er):
Often drop final silent e if the suffix begins with a vowel (e.g., drive → driver , use → usable ).
Grade 3 Morphology Lab • Word Crafters Lesson 2 Teacher Guide & Key
