Prefixes worksheet for Grade 3 English students, using a word bank to complete words with correct prefixes.

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 valid.
But "re-ject" = reject — also valid.
But since "in-" is in the box, and "inject" is a real word, and "reject" is also real, we must pick based on logic.

But notice: "re-ject" is more likely than "in-ject" because "in-" might conflict with "im-" for some words.

Wait — "in-ject" is fine.
But let’s hold off and come back.

Actually, let’s move forward and check if any of these are repeated.

But looking at the pattern:

Later we have:
- re-appear
- re-wind
- re-agree
- re-fess? No — confess → re-confess? Not common.
- re-pel? repel — yes!

So "re-" is used multiple times.

Back to "___ ject" — possibilities:
- in-ject → inject
- re-ject → reject
- dis-ject? Not common.
- pre-ject? No.
- pro-ject? Yes! project — "pro-ject"

Ah! "pro-ject" → project — very common.

And "pro-" is in the box.

✔ So pro-ject

That makes sense.

So far:
- ex-chief
- dis-trust
- dis-obey
- un-well
- re-pair
- de-vise
- pro-ject

All make sense.

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📝 Column 2:

8. ______ fect
→ "per-" not in box.
→ "im-" → imfect? No.
→ "in-" → infect? Yes!
→ "dis-" → disfect? No.
→ "re-" → refect? No.
→ "de-" → defect? Yes!
→ "dis-" → disfect? No.
→ "non-" → nonfect? No.
→ "mis-" → misfect? No.
→ "im-" → imperfect? But here it's "fect", so "im-" + "fect" = imfect? No.
→ Wait: "im-" + "perfect" = imperfect — but here it's just "fect".
→ But "defect" is a real word.
→ "de-" + "fect" = defect
✔ de-fect

9. ______ appear
→ "re-" → reappear — yes!
✔ re-appear

10. ______ corn
→ "ex-" → ex-corn? No.
→ "de-" → de-corn? No.
→ "dis-" → dis-corn? No.
→ "un-" → un-corn? No.
→ "mis-" → mis-corn? No.
→ "im-" → im-corn? No.
→ "non-" → non-corn? No.
→ "pro-" → pro-corn? No.
→ "pre-" → pre-corn? No.
→ Wait — "corn" → "corncob"? Not helpful.
→ Maybe "ex-" → ex-corn? No.
→ Wait — "de-corn"? No.
→ What about "un-corn"? No.
→ Wait — maybe "mis-corn"? No.
→ Think: "corn" → "corna"? No.
→ Wait — "ex-" → ex-husband, but not for corn.
→ Is there a word like "dis-corn"? No.
→ Wait — "dis-" → disdain? Not related.
→ Actually, "dis-" + "corn"? No.
→ Wait — "un-" → un-corn? No.
→ Hmm.
→ Perhaps "de-" → de-corn? No.
→ Wait — "re-" → re-corn? No.
→ Wait — what about "ex-" → ex-corn? No.
→ This seems odd.
→ Wait — is it "dis-" → dis-corn? No.
→ Wait — "im-" → im-corn? No.
→ Wait — perhaps it's "ex-" → ex-corn? No.
→ Wait — "dis-" → dis-corn? No.
→ Wait — "non-" → non-corn? No.
→ Wait — "mis-" → mis-corn? No.
→ Wait — "un-" → un-corn? No.
→ Wait — "de-" → de-corn? No.
→ Wait — "pre-" → pre-corn? No.
→ Wait — "pro-" → pro-corn? No.
→ Wait — is it "dis-" → dis-corn? No.
→ Wait — "un-" → un-corn? No.
→ Wait — "dis-" → dis-corn? No.
→ Wait — "dis-" → dis-corn? No.
→ Wait — "de-" → de-corn? No.
→ Wait — "re-" → re-corn? No.
→ Wait — "im-" → im-corn? No.
→ Wait — "non-" → non-corn? No.
→ Wait — "uni-" → uni-corn? Ah! Unicorn!
→ "uni-" + "corn" = unicorn
✔ uni-corn

Yes! That’s it. "Uni-" is in the box.

So: uni-corn

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

12. ______ tidy
→ "dis-" → dis-tidy? No.
→ "un-" → un-tidy — 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.
→ "dis-" → dishale? No.
→ "re-" → rehale? 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.
→ "re-" → refess? No.
→ "dis-" → disfess? No.
→ "con-" → confess — but "con-" not in box.
→ "re-" → re-fess? No.
→ Wait — "con-" is not in the box.
→ But "con-" is not listed.
→ Wait — "dis-" → dis-fess? No.
→ Wait — "re-" → re-fess? No.
→ Wait — "pro-" → pro-fess? Yes! profess
→ "pro-" + "fess" = profess
✔ pro-fess

21. ______ pert
→ "re-" → repert? No.
→ "dis-" → dispert? No.
→ "in-" → inpert? No.
→ "im-" → impert? No.
→ "un-" → unpert? No.
→ "re-" → repert? No.
→ "pre-" → prepert? No.
→ "pro-" → propert? No.
→ "dis-" → dispert? No.
→ Wait — "im-" → impertinent? But here it's "pert".
→ Wait — "im-" + "pert" = impert? No.
→ Wait — "dis-" → dis-pert? No.
→ Wait — "re-" → re-pert? No.
→ Wait — "non-" → non-pert? No.
→ Wait — "in-" → in-pert? No.
→ Wait — "ex-" → ex-pert? Yes! expert
→ "ex-" + "pert" = expert
✔ ex-pert

Yes! "ex-" is in the box.

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✔ Final Answers:

Let’s compile them all now.

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🟩 Column 1:

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

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🟨 Column 2:

8. de-fect
9. re-appear
10. uni-corn
11. mis-behave
12. un-tidy
13. im-possible
14. pro-duce

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🟦 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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✔ Complete Answer Key:

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

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🧠 Explanation Summary:

- Prefixes change the meaning of the root word.
- For example:
- dis- means "not" or "opposite": *disagree*, *disobey*
- re- means "again": *reappear*, *rewind*
- un- means "not": *unwell*, *untidy*
- im- means "not": *impossible*
- ex- means "former": *ex-chief*, *expert* (from "ex-pert")
- uni- means "one": *unicorn*
- pro- means "forward" or "before": *project*, *produce*, *profess*
- de- means "down" or "remove": *defect*, *de-vise* (to devise)
- in- means "not" or "into": *inhale*

Some words like "de-vise" might be less familiar, but they are valid.

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✔ All words are correctly completed using prefixes from the word bank.

Let me know if you'd like this printed or formatted as a worksheet!