14 Prefixes Suffixes ROOT- WORDS Worksheets - Free PDF at ... - Free Printable

Let's solve this worksheet step by step. The goal is to identify the prefix, root word, and suffix for each given word. Remember:

- A prefix is added to the beginning of a root word.
- A root word is the core part of the word that carries the main meaning.
- A suffix is added to the end of a root word.

We'll go through each word one at a time.

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1. preheat

- Prefix: *pre-* (means "before")
- Root word: *heat*
- Suffix: none

✔ Answer:
- Prefix: pre
- Root Word: heat
- Suffix: (blank)

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2. unkind

- Prefix: *un-* (means "not")
- Root word: *kind*
- Suffix: none

✔ Answer:
- Prefix: un
- Root Word: kind
- Suffix: (blank)

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3. undersea

- Prefix: *under-* (means "beneath")
- Root word: *sea*
- Suffix: none

✔ Answer:
- Prefix: under
- Root Word: sea
- Suffix: (blank)

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4. submarine

- Prefix: *sub-* (means "under")
- Root word: *marine* (related to the sea)
- Suffix: none

✔ Answer:
- Prefix: sub
- Root Word: marine
- Suffix: (blank)

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5. comfortable

- Prefix: none
- Root word: *comfort*
- Suffix: *-able* (means "capable of")

✔ Answer:
- Prefix: (blank)
- Root Word: comfort
- Suffix: able

---

6. wonderful

- Prefix: none
- Root word: *wonder*
- Suffix: *-ful* (means "full of")

✔ Answer:
- Prefix: (blank)
- Root Word: wonder
- Suffix: ful

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7. defrost

- Prefix: *de-* (means "reverse" or "remove")
- Root word: *frost*
- Suffix: none

✔ Answer:
- Prefix: de
- Root Word: frost
- Suffix: (blank)

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8. overlook

- Prefix: *over-* (means "above" or "excessive")
- Root word: *look*
- Suffix: none

✔ Answer:
- Prefix: over
- Root Word: look
- Suffix: (blank)

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9. quickly

- Prefix: none
- Root word: *quick*
- Suffix: *-ly* (adverbial ending, means "in a quick manner")

✔ Answer:
- Prefix: (blank)
- Root Word: quick
- Suffix: ly

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10. breathless

- Prefix: none
- Root word: *breathe*
- Suffix: *-less* (means "without")

✔ Answer:
- Prefix: (blank)
- Root Word: breathe
- Suffix: less

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11. tallest

- Prefix: none
- Root word: *tall*
- Suffix: *-est* (comparative/superlative form)

✔ Answer:
- Prefix: (blank)
- Root Word: tall
- Suffix: est

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12. worthless

- Prefix: none
- Root word: *worth*
- Suffix: *-less* (means "without")

✔ Answer:
- Prefix: (blank)
- Root Word: worth
- Suffix: less

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13. replay

- Prefix: *re-* (means "again")
- Root word: *play*
- Suffix: none

✔ Answer:
- Prefix: re
- Root Word: play
- Suffix: (blank)

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14. ungrateful

- Prefix: *un-* (means "not")
- Root word: *grateful*
- Suffix: none

Wait — but *grateful* itself has a suffix (*-ful*), so we're analyzing only the main parts of the compound word.

But here, “ungrateful” = *un-* + *grate* + *-ful*

But since we are breaking it into prefix, root, and suffix:
- Prefix: *un-*
- Root word: *grate* (but note: "grateful" is derived from "grate" + "-ful", but "grateful" is not a standalone root word)

Actually, better to treat “grateful” as the root word with suffix *-ful*, but since we're splitting into three parts, let's do:

- Prefix: *un-*
- Root word: *grateful*? No — that would be incorrect because "grateful" already includes a suffix.

So, better breakdown:
- Prefix: *un-*
- Root word: *grate*
- Suffix: *-ful*

But "grate" isn't a real word on its own — actually, "grateful" comes from "grate" (as in "gratify") → Latin *gratus*.

But for simplicity in elementary-level word analysis, we often consider:

- un- (prefix)
- grateful → root word? No.

Actually, standard approach:
"Ungrateful" = un- (prefix) + grateful (root word) → but "grateful" has its own suffix.

So instead, break it as:
- Prefix: *un-*
- Root word: *grate*
- Suffix: *-ful*

But "grate" is not commonly used alone.

Alternatively, recognize that “grateful” is the root with suffix -ful, so:
- Prefix: *un-*
- Root word: *grate*
- Suffix: *-ful*

But since "grate" isn’t a standalone word, perhaps better to treat "grateful" as the base, but that’s not correct.

Standard way in grade-level teaching:
- un- (prefix)
- grate (root)
- -ful (suffix)

Yes, even though "grate" is not a common word, it's accepted in morphology.

✔ Answer:
- Prefix: un
- Root Word: grate
- Suffix: ful

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15. underground

- Prefix: *under-* (means "beneath")
- Root word: *ground*
- Suffix: none

✔ Answer:
- Prefix: under
- Root Word: ground
- Suffix: (blank)

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16. tallest (duplicate)

Same as #11:
- Prefix: none
- Root word: *tall*
- Suffix: *-est*

✔ Answer:
- Prefix: (blank)
- Root Word: tall
- Suffix: est

---

17. unhappy

- Prefix: *un-* (means "not")
- Root word: *happy*
- Suffix: none

✔ Answer:
- Prefix: un
- Root Word: happy
- Suffix: (blank)

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18. preschool

- Prefix: *pre-* (means "before")
- Root word: *school*
- Suffix: none

✔ Answer:
- Prefix: pre
- Root Word: school
- Suffix: (blank)

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19. disappear

- Prefix: *dis-* (means "not" or "away")
- Root word: *appear*
- Suffix: none

✔ Answer:
- Prefix: dis
- Root Word: appear
- Suffix: (blank)

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## ✔ Final Answer Table:

| WORDS | PREFIX | ROOT WORD | SUFFIX |
|-------------|----------|----------------|--------|
| preheat | pre | heat | |
| unkind | un | kind | |
| undersea | under | sea | |
| submarine | sub | marine | |
| comfortable | | comfort | able |
| wonderful | | wonder | ful |
| defrost | de | frost | |
| overlook | over | look | |
| quickly | | quick | ly |
| breathless | | breathe | less |
| tallest | | tall | est |
| worthless | | worth | less |
| replay | re | play | |
| ungrateful | un | grate | ful |
| underground | under | ground | |
| tallest | | tall | est |
| unhappy | un | happy | |
| preschool | pre | school | |
| disappear | dis | appear | |

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Notes:

- Some words like "ungrateful" are tricky because "grateful" itself contains a suffix. But in this context, we’re treating it as:
- *un-* (prefix)
- *grate* (root)
- *-ful* (suffix)
- Words like "tallest" appear twice — just repeat the same answer.

This worksheet helps students understand how prefixes and suffixes modify root words to create new meanings.