Where does the apostrophe go for plural owners?

After the s that's already there: the players' bench, the twins' room. The word did its plural work first, then the apostrophe claims ownership. One owner, apostrophe before the s; many owners ending in s, apostrophe after.

What about children and other irregular plurals?

They take apostrophe-s just like singulars: children's coats, men's choir, mice's tracks. Since the plural doesn't end in s, there's no s to put the apostrophe after. Kids find this easier than adults expect once it's stated plainly.

3rd grade possessive nouns

3rd grade possessive nouns worksheets

Third graders handle both ends of the rule: singular owners take apostrophe-s (the fox's den) and plural owners ending in s take just the apostrophe (the players' jerseys). Irregular plurals like children behave like singulars: children's.

Free printable PDF worksheet, aligned to Common Core L.3.2.d.

Each print is a different sheet with its own answer key. You don't need to sign up.

The kind of sentences you'll fix

Write the possessive form of the word in parentheses.

The (cook) timer buzzed twice.
Fixed: The cook’s timer buzzed twice.
The (cat) tail flicked at the moth.
The (rabbit) ears twitched at the sound.

Every print pulls a new set of sentences at this level, so a make-up test or a second sibling gets a different mix.

What's on a 3rd grade sheet

3rd grade sheets draw from 79 sentences, 8 to a page. All 59 of 2nd grade's sentences are here too, plus 20 more. 2nd grade sheets print 7 to a page.

A few of the sentences, as the answer key corrects them:

The team’s banner hung above the bleachers.
The runner’s shoelace came untied at the turn.
The players’ jerseys were washed after every game.

Fix it. Write the possessive form of the word in parentheses. 8 sentences to fix per page.
Choose the word. Circle the letter of the correctly written owner. 10 questions per page.

Every version prints on US Letter or A4, with its answer key on the last page.

How to teach this

Teach the s-apostrophe flip as a two-question routine: who owns it, and does that word already end in s? One owner: add 's. Owners ending in s: add just the apostrophe. Then spring the irregulars (children's, men's, mice's) and let students discover they follow the first rule.

Watch for: The apostrophe never makes a plain plural: three dogs, no apostrophe; the dog's bone, apostrophe for owning. Irregular plurals act like singulars: the children's coats, the men's choir.

Common questions about 3rd grade possessive nouns

Where does the apostrophe go for plural owners?: After the s that's already there: the players' bench, the twins' room. The word did its plural work first, then the apostrophe claims ownership. One owner, apostrophe before the s; many owners ending in s, apostrophe after.
What about children and other irregular plurals?: They take apostrophe-s just like singulars: children's coats, men's choir, mice's tracks. Since the plural doesn't end in s, there's no s to put the apostrophe after. Kids find this easier than adults expect once it's stated plainly.

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Aligned to Common Core L.3.2.d. Reviewed by the One more sheet team. Content version 241, updated October 2026.

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