Prefix Worksheets -Grade1to6.com - Free Printable

Let's solve this Grade 3 English worksheet on prefixes step by step.

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🔤 Objective:

Use the prefixes from the Word Box to complete each word. The goal is to form real, meaningful words using the given root words and choosing the correct prefix.

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✔ Word Box (Prefixes):

- un-
- mis-
- im-
- re-
- uni-
- ex-
- de-
- pre-
- in-
- dis-
- non-
- pro-

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We will go through each blank and determine which prefix makes sense.

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📝 Column 1:

1. ______ chief
→ "un-" → unchief? No.
→ "ex-" → ex-chief? Yes! Meaning: former chief.
✔ ex-chief

2. ______ trust
→ "dis-" → distrust (lack of trust)
✔ dis-trust

3. ______ obey
→ "dis-" → disobey (not obey)
✔ dis-obey

4. ______ well
→ "un-" → unwell (not well)
✔ un-well

5. ______ pair
→ "un-" → unpair? Not common.
→ "mis-" → mispair? Rare.
→ "re-" → repair? Wait — "re-pair" = repair
✔ re-pair

6. ______ vise
→ "pre-" → pre-vise? No.
→ "advice"? But here it's "vise".
→ "pro-" → pro-vise? No.
→ "dis-" → dis-vise? No.
→ "con-" not in list.
→ Wait — advice is a word, but we have "vise".
Actually, "advice" is not the base.
Think: "advise" → "disadvise"? Not standard.
Wait — perhaps it's "pro-vise"? Still no.
Let’s look at the spelling: "vise" could be part of "advice", but that doesn’t fit.
Alternatively, think: "de-vise"? → "devise" means to invent.
✔ de-vise — yes! "de-" as in "to create" or "formulate".
So, de-vise

7. ______ ject
→ "dis-" → disject? Not common.
→ "pro-" → project? Yes!
→ "re-" → reject? Yes!
→ "in-" → inject? Yes!
→ But only one answer per line.
→ We need to pick the best fit.
But wait — "reject" is common.
→ "dis-" → disject? No.
→ "eject"? "e-" not in box.
→ "in-" → inject? Yes, "in-ject"
→ "re-" → reject? Yes.
→ But which one?
Look at other clues.
Later we have "pro-duce" → produce
And "re-ject" → reject
But let's see:
→ "dis-" → disject? Not common.
→ "im-" → imject? No.
→ "re-" → reject — valid
→ "in-" → inject — valid
But both are possible.
However, “in-ject” is more commonly taught in Grade 3 than “reject”.
But wait — “dis-” → disject? Not used.
→ Actually, “dis-” + ject = disject — rare.
→ “re-” → reject — common.
→ “in-” → inject — also common.
But note: “pre-” → preject? No.
→ Only “in-” and “re-” work.
But let’s look at "dis-appear" later — so “dis-” is used.
Now, "in-ject" is correct.
✔ in-ject

Wait — actually, "in-ject" is inject, meaning to put something into.
Yes, that’s correct.
But "re-ject" is reject, meaning to refuse.
Both are valid.
But let’s check if any prefix is already used.

Wait — maybe "dis-ject" is not a word.
So likely: "in-ject" or "re-ject"?

Let’s hold off and come back.

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Let’s move to column 2 and 3 for better context.

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📝 Column 2:

8. ______ fect
→ "per-" not in box.
→ "im-" → imfect? No.
→ "dis-" → disfect? No.
→ "re-" → refect? No.
→ "un-" → unfect? No.
→ Wait — "perfect"? But "per" not in box.
→ "defect" — "de-" + "fect" → de-fect
✔ de-fect — meaning flaw

9. ______ appear
→ "dis-" → disappear — yes!
✔ dis-appear

10. ______ corn
→ "ex-" → ex-corn? No.
→ "un-" → un-corn? No.
→ "mis-" → mis-corn? No.
→ "re-" → re-corn? No.
→ "im-" → im-corn? No.
→ Wait — "unicorn" — "uni-" + "corn"
✔ uni-corn

11. ______ behave
→ "mis-" → misbehave — yes!
✔ mis-behave

12. ______ tidy
→ "un-" → untidy — yes!
✔ un-tidy

13. ______ possible
→ "im-" → impossible — yes!
✔ im-possible

14. ______ duce
→ "pro-" → produce — yes!
✔ pro-duce

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📝 Column 3:

15. ______ please
→ "dis-" → displease — yes!
✔ dis-please

16. ______ hale
→ "un-" → unhale? No.
→ "in-" → inhale — yes!
✔ in-hale

17. ______ wind
→ "re-" → rewind — yes!
✔ re-wind

18. ______ agree
→ "dis-" → disagree — yes!
✔ dis-agree

19. ______ pel
→ "re-" → repel — yes!
✔ re-pel

20. ______ fess
→ "con-" not in box.
→ "dis-" → disfess? No.
→ "re-" → refess? No.
→ "confess"? But "con" not in box.
→ Wait — "profess" — "pro-" + "fess"
✔ pro-fess

21. ______ pert
→ "re-" → repert? No.
→ "im-" → impert? No.
→ "in-" → inpert? No.
→ "non-" → nonpert? No.
→ Wait — "unpert"? No.
→ "expert" — "ex-" + "pert"
✔ ex-pert

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Now, going back to Column 1:

Let’s fill in what we have:

1. ex-chief ✔
2. dis-trust ✔
3. dis-obey ✔
4. un-well ✔
5. re-pair ✔
6. de-vise ✔
7. in-ject or re-ject?

Wait — now we see that "re-" is already used for "re-wind", "re-pel", etc.
But prefixes can be reused.

But let’s check: "in-ject" → inject
"re-ject" → reject

Which one is more likely?

But look — "in-" is used in "in-hale", "in-" is available.

Also, "dis-" is used multiple times.

But let’s see: "in-ject" is a valid word.

But wait — is there a better fit?

Wait — "de-ject"? → "dejected" — but "de-" is used in "defect", "de-vise".

But "in-ject" is fine.

Alternatively, could it be "re-ject"?

Yes, "reject" is a common word.

But "in-ject" is also common.

But let’s look at the pattern.

Wait — in column 2, we have "re-duce" → produce

So "pro-" is used.

In column 3, "re-pel", "re-wind"

So "re-" is used.

But "in-ject" uses "in-", which is used in "in-hale" — okay.

But let’s double-check: "in-ject" = inject
"re-ject" = reject

Both are valid.

But notice: "dis-" is used in disappear, displease, disagree, dis-trust, dis-obey

So "dis-" is heavily used.

But "in-" is used in in-hale

And "re-" in re-wind, re-pel

Now, "in-ject" is less common than "reject" in basic vocabulary.

But "inject" is a real word.

Wait — is there another possibility?

What about "pro-ject"? → project — yes!

But "pro-" is already used in "pro-duce" and "pro-fess"

But prefixes can be reused.

But "pro-ject" is a strong candidate.

Is "pro-" allowed? Yes, it's in the word box.

So:

- pro-ject → project
- in-ject → inject
- re-ject → reject

All three are valid.

But which one fits best?

Let’s consider the most common and appropriate word.

"Project" is very common in school contexts.

Also, "project" is often taught with "pro-" prefix.

Moreover, "in-ject" might be too advanced.

But "reject" is also common.

Wait — "dis-ject"? No.

But "in-ject" is correct.

But let’s look at "de-vise" — "de-" means "to make" or "formulate"

Similarly, "pro-ject" means "to throw forward" — "pro" = forward

But "in-ject" = to put in

All are valid.

But "project" is more common in Grade 3.

Wait — let’s see if "pro-" is already used.

Yes: "pro-duce", "pro-fess" — both use "pro-"

So "pro-ject" would reuse "pro-", which is allowed.

But "in-ject" uses "in-", which is used in "in-hale"

Also acceptable.

But let’s think: "in-ject" is inject, which is not typically used in Grade 3.

Whereas "reject" is common.

But "project" is even more common.

But "project" is not a direct antonym or opposite; it's just a compound.

Wait — but "project" is a real word.

But let’s check the spelling: "pro-ject" — yes.

But is "in-ject" possible?

Yes, but less common.

But here’s a clue: "in-" is used in "in-hale", so "in-ject" fits.

But let’s count how many times each prefix is used.

We have:

- un-: unwell → 1
- dis-: distrust, disobey, disappear, displease, disagree → 5
- re-: rewind, repel → 2
- ex-: ex-chief → 1
- de-: defect, devise → 2
- pro-: produce, profess → 2
- in-: inhale → 1
- uni-: unicorn → 1
- im-: impossible → 1
- mis-: misbehave → 1
- non-: none used yet
- pre-: none used yet

Wait — "pre-" is not used yet.

Is there a word like "pre-ject"? → preject? No.

"pre-appear"? No.

"pre-pair"? No.

"pre-lease"? No.

So "pre-" is unused.

But "pre-" + "fect" = prefect? Yes! "prefect" — a school official.

But in the list, it's "______ fect" — yes!

So "pre-fect" → prefect

Ah! That’s it!

Earlier I said "de-fect", but "pre-fect" is also a word.

But "defect" is more common.

But "prefect" is a valid word.

But "defect" means flaw, "prefect" means a student leader.

But in context, "defect" is more likely.

But let’s see: "pre-" is not used anywhere else.

But "de-" is used in "defect" and "devise" — two times.

But "pre-" is available.

But "pre-fect" is a real word.

But "de-fect" is more common.

But let’s check: "pre-" + "fect" = prefect — yes.

But "de-" + "fect" = defect — yes.

Now, which one is intended?

Look at the word "defect" — it's a noun meaning flaw.

"Prefect" is a person.

But in a Grade 3 context, "defect" might be harder.

But "prefect" is common in schools.

But the root is "fect", which comes from Latin "facere" = to do.

So "defect" = "to fail to do" → flaw

"prefect" = "before doing" → someone who leads

But both are valid.

But in the word bank, "de-" is present.

But "pre-" is also present.

But we already have "pre-" unused.

But "de-" is used in "devise" and "defect" — two words.

But "pre-" is only used once.

But "defect" is more common.

But let’s see: "de-fect" — yes.

But wait — "de-" is used in "de-vise", so "de-fect" is consistent.

But "pre-fect" is also valid.

But in most such worksheets, "defect" is expected.

So I’ll go with "de-fect".

Back to "______ ject"

We have:

- in-ject → inject
- re-ject → reject
- pro-ject → project

But "pro-" is already used twice.

But allowed.

But "in-" is used once.

But "re-" is used twice.

But "project" is a very common word.

But "reject" is also common.

But let’s see: "dis-" is used five times — overused?

But it’s okay.

But "in-ject" is inject, which is not typically taught in Grade 3.

Whereas "reject" is.

But "project" is even more common.

But "project" is pro-ject, and "pro-" is already used in "produce" and "profess" — so it’s fine.

But let’s check if "in-ject" is acceptable.

Actually, "inject" is a Level 4 word, while "reject" is Level 3.

But "project" is Level 2.

So "project" is best.

But is "pro-ject" in the list?

Yes — "______ ject"

So pro-ject → project

✔ pro-ject

Then "in-ject" would be inject, but "in-" is used in "in-hale", so okay.

But "project" is better.

But wait — "pro-" is used in "produce" and "profess", so it’s okay.

But "pro-ject" is correct.

But let’s confirm: "pro-ject" = project

Yes.

But "in-ject" = inject — also correct.

But in Grade 3, "project" is more common.

But let’s see the final decision.

Wait — "in-ject" is not listed in many dictionaries as a common word.

Whereas "project" is.

But "reject" is also common.

But "pro-" is already used.

But prefixes can be reused.

So "pro-ject" is acceptable.

But let’s look at the entire list.

We have:

- ex-chief ✔
- dis-trust ✔
- dis-obey ✔
- un-well ✔
- re-pair ✔
- de-vise ✔
- pro-ject ✔
- de-fect ✔
- dis-appear ✔
- uni-corn ✔
- mis-behave ✔
- un-tidy ✔
- im-possible ✔
- pro-duce ✔
- dis-please ✔
- in-hale ✔
- re-wind ✔
- dis-agree ✔
- re-pel ✔
- pro-fess ✔
- ex-pert ✔

Wait — "ex-pert" → expert

Yes.

Now, all prefixes are used.

But "pre-" is not used.

Is there a word missing?

No — "pre-" is not needed.

"non-" is not used.

But that’s okay.

So final answers:

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✔ Final Answer:

#### Column 1:
1. ex-chief
2. dis-trust
3. dis-obey
4. un-well
5. re-pair
6. de-vise
7. pro-ject

#### Column 2:
8. de-fect
9. dis-appear
10. uni-corn
11. mis-behave
12. un-tidy
13. im-possible
14. pro-duce

#### Column 3:
15. dis-please
16. in-hale
17. re-wind
18. dis-agree
19. re-pel
20. pro-fess
21. ex-pert

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🔍 Explanation:

- Each word is formed by adding a prefix from the word bank.
- The prefix changes the meaning of the root word.
- For example:
- dis- means "not" or "opposite" → disobey = not obey
- re- means "again" → rewind = wind again
- pre- means "before" → prefect = before (but not used)
- im- means "not" → impossible = not possible
- ex- means "former" → ex-chief = former chief
- uni- means "one" → unicorn = one horn
- in- means "not" or "into" → in-hale = breathe in
- pro- means "forward" or "before" → produce = bring forward, profess = declare publicly

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✔ Final List:

| Word | Completed |
|------|-----------|
| ______ chief | ex-chief |
| ______ trust | dis-trust |
| ______ obey | dis-obey |
| ______ well | un-well |
| ______ pair | re-pair |
| ______ vise | de-vise |
| ______ ject | pro-ject |
| ______ fect | de-fect |
| ______ appear | dis-appear |
| ______ corn | uni-corn |
| ______ behave | mis-behave |
| ______ tidy | un-tidy |
| ______ possible | im-possible |
| ______ duce | pro-duce |
| ______ please | dis-please |
| ______ hale | in-hale |
| ______ wind | re-wind |
| ______ agree | dis-agree |
| ______ pel | re-pel |
| ______ fess | pro-fess |
| ______ pert | ex-pert |

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This completes the worksheet!