Match prefixes with root words to form new words in this educational worksheet.

Let’s solve this step by step.

We need to match each prefix with the correct root word to make a real, meaningful English word. Then write the new word in the box below.

Here are the prefixes and roots:

Prefixes:
1. un
2. re
3. pre
4. mis
5. dis
6. im
7. in

Roots:
- known
- heat
- do
- pronounce
- perfect
- grown
- honest

Now let’s think about common words we know that start with these prefixes.

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Step 1: Match “un”

“Un” usually means “not” or “reverse.”
What can go with “known”? → unknown ✔
That’s a real word. So #1 = unknown

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Step 2: Match “re”

“Re” means “again.”
What can you do again? You can “do” something again → redo ✔
Also, “heat” → reheat is also possible… but let’s see which fits best overall.

Wait — let’s hold on. Let’s try all matches first before deciding.

Actually, “re” + “heat” = reheat (to heat again)
“re” + “do” = redo (to do again)

Both are valid. But we have to use each root only once.

Let’s look at other prefixes.

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Step 3: Match “pre”

“Pre” means “before.”
What comes before?
“pronounce” → prepronounce? No, not a word.
“grown” → pregrown? Not really.
“perfect” → preperfect? No.
“honest” → prehonest? No.
“do” → predo? Not common.
“heat” → preheat? YES! Like preheating an oven. ✔
So #3 = preheat

Then “re” must go with “do” → redo ✔
So #2 = redo

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Step 4: Match “mis”

“Mis” means “wrongly.”
“pronounce” → mispronounce (say it wrong) ✔
Perfect fit. So #4 = mispronounce

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Step 5: Match “dis”

“Dis” often means “not” or “opposite.”
“honest” → dishonest (not honest) ✔
Also, “perfect” → disperfect? Not a word.
“grown” → disgrown? No.
So #5 = dishonest

Wait — but “in” might also go with “honest” → inhonest? No, that’s not right. It’s “dishonest.”

But what about “im”? “Im” + “perfect” = imperfect ✔
And “in” + “grown” → ingrown? That’s a word too!

Let’s check:

“im” + “perfect” = imperfect → yes, very common
“in” + “grown” = ingrown → like an ingrown toenail — yes, that’s a real word
“dis” + “honest” = dishonest → yes

But wait — we have “in” and “im” both meaning “not,” but they’re used differently based on the root.

Standard rule:
- “im” is used before words starting with p, b, m → so “imperfect” ✔
- “in” is used before others → “ingrown” is okay, but actually “ingrown” is more of a compound than a prefix+root in school terms? Hmm.

Wait — let’s double-check standard elementary level matches.

Common pairs taught in schools:

- un + known = unknown
- re + do = redo
- pre + heat = preheat
- mis + pronounce = mispronounce
- dis + honest = dishonest
- im + perfect = imperfect
- in + grown = ingrown? Or maybe “in” + “honest” doesn’t work...

Wait — “in” + “honest” = inhonest? Not a word.
“in” + “grown” = ingrown — acceptable.

But let’s see if there’s a better match.

What about “dis” + “perfect”? Disperfect? Not a word.
“dis” + “grown”? Disgrown? No.

Another possibility: “in” + “perfect”? Inperfect? No — it’s “imperfect”.

Actually, “im” is specifically for “perfect” → imperfect.

Then “in” must go with “grown” → ingrown.

But is “ingrown” typically taught as a prefix example at this level? Maybe not.

Wait — perhaps I made a mistake earlier.

Let me list all possible correct combinations:

✔ un + known = unknown
✔ re + do = redo
✔ pre + heat = preheat
✔ mis + pronounce = mispronounce
✔ dis + honest = dishonest
✔ im + perfect = imperfect
✔ in + grown = ingrown ← this is the only one left.

Yes, “ingrown” is a valid word. For example, “ingrown hair” or “ingrown toenail.”

So even though it’s less common in basic prefix lessons, it’s still correct.

Alternatively — could “in” go with “honest”? No, because “inhonest” isn’t a word. The correct form is “dishonest.”

So our matching is:

1. un → known → unknown
2. re → do → redo
3. pre → heat → preheat
4. mis → pronounce → mispronounce
5. dis → honest → dishonest
6. im → perfect → imperfect
7. in → grown → ingrown

All are real words.

Now, write them in order in the boxes:

Box 1: unknown
Box 2: redo
Box 3: preheat
Box 4: mispronounce
Box 5: dishonest
Box 6: imperfect
Box 7: ingrown

Wait — let’s confirm numbering.

The prefixes are numbered 1 to 7 on the left.

So:

1. un → unknown
2. re → redo
3. pre → preheat
4. mis → mispronounce
5. dis → dishonest
6. im → imperfect
7. in → ingrown

Yes.

Final Answer:

1. unknown
2. redo
3. preheat
4. mispronounce
5. dishonest
6. imperfect
7. ingrown