Prefix and suffix worksheet for students to practice completing words with correct prefixes.

Let's solve this Prefix and Suffix worksheet step by step. The goal is to choose the correct prefix (a word part added to the beginning of a root word) to complete each sentence logically and grammatically.

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🔍 Understanding Prefixes:

Common prefixes include:
- pre- = before
- re- = again, back
- dis- = not, opposite
- mis- = wrong
- over- = too much
- under- = less than
- un- = not
- pro- = forward, in favor of
- post- = after
- re- = again

We’ll analyze each sentence and pick the best prefix that makes sense.

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✔ Answers with Explanations:

1. Mom had to _____heat the oven to 350° to bake the cake.
→ Preheat means to heat something *before* using it.
✔ Answer: pre

2. To help keep the Earth clean, we cycle all of our plastic.
→ "Cycle" here is a verb meaning to recycle. But the word should be recycle – to reuse materials.
✔ Answer: re

3. I looked over my writing and found a _____spelled word.
→ A word that is spelled incorrectly = misspelled.
✔ Answer: mis

4. Before you take off your shoes, you need to _____tie them.
→ You tie your shoes *before* taking them off? No — actually, you untie them first. So the correct word is untie.
✔ Answer: un

5. You may be correct, but I _____agree with you.
→ If someone disagrees, they disagree.
✔ Answer: dis

6. We checked the _____cast before we planned the event.
→ We check the forecast (weather prediction) before planning an outdoor event.
✔ Answer: fore

7. The big, gray _____marine plunged down into the water.
→ A whale is a marine animal. But the word is likely meant to be mammal, so "marine mammal". But the blank is for a prefix. Wait — perhaps it's "great white shark"? But no — the word is "marine", so maybe it’s "gray whale"?
Actually, this might be a typo or formatting issue. But looking closely: “big, gray ______ marine” — probably meant to be "giant" or "large", but that’s not a prefix.

Wait — perhaps it’s "the big, gray ___marine" → likely intended as "the big, gray whale", but the blank is for a prefix?

Wait — could it be "submarine"? But that doesn’t fit.

Alternatively, perhaps the intended word is "mammal", but that’s not a prefix.

But if we look at "marine" — could it be "submarine"? That would make sense: "The big, gray submarine plunged..."
So: submarine → prefix sub- = under

✔ Answer: sub

8. If you want to be ready for something, you need to _____pare.
→ "Prepare" means to get ready. The prefix is pre- = before.
✔ Answer: pre

9. Make sure you _____turn the library book on time!
→ Return a book = return.
✔ Answer: re

10. I try to be careful but sometimes I make a _____take.
→ "Mistake" — a wrong action.
✔ Answer: mis

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📝 Final Answers:

| # | Sentence | Correct Prefix | Word |
|---|--------|----------------|------|
| 1 | Mom had to ____heat the oven... | pre | preheat |
| 2 | ...we cycle all of our plastic. | re | recycle |
| 3 | ...found a ____spelled word. | mis | misspelled |
| 4 | ...need to ____tie them. | un | untie |
| 5 | ...but I ____agree with you. | dis | disagree |
| 6 | We checked the ____cast... | fore | forecast |
| 7 | The big, gray ____marine... | sub | submarine |
| 8 | ...you need to ____pare. | pre | prepare |
| 9 | Make sure you ____turn... | re | return |
| 10 | ...make a ____take. | mis | mistake |

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✔ Completed Worksheet:

1. Mom had to preheat the oven to 350° to bake the cake.
2. To help keep the Earth clean, we recycle all of our plastic.
3. I looked over my writing and found a misspelled word.
4. Before you take off your shoes, you need to untie them.
5. You may be correct, but I disagree with you.
6. We checked the forecast before we planned the event.
7. The big, gray submarine plunged down into the water.
8. If you want to be ready for something, you need to prepare.
9. Make sure you return the library book on time!
10. I try to be careful but sometimes I make a mistake.

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💡 Key Takeaway:

This exercise teaches how prefixes change the meaning of words. For example:
- re- = again (recycle, return)
- pre- = before (preheat, prepare)
- mis- = wrong (misspelled, mistake)
- dis- = not (disagree)
- un- = not (untie)
- sub- = under (submarine)
- fore- = before (forecast)

Great job! This helps build vocabulary and understanding of word structure. 😊