What is the difference between -ive and -ize?

Job, not just spelling: -ive makes describing words (active, expensive), -ize makes doing words (realize, memorize). The sort teaches both the letters and the roles.

Why learn them as a pair?

Contrast teaches faster than isolation: seeing the two jobs side by side makes suffix-as-word-builder visible, which is the real lesson under the spelling.

4th grade suffixes -ive and -ize

4th grade suffixes -ive and -ize worksheets

Fourth graders sort -ive and -ize words and meet the two jobs: -ive builds adjectives (active, massive), -ize builds verbs (realize, organize).

Free printable PDF worksheet, aligned to Common Core L.4.4.b.

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

The kind of words you'll complete and sort

Fill in the missing letters to make a real word, then write the whole word in its column.

energrealpositrecogncreatact

Columns: -ive and -ize. Only ive turns "posit_" into a real word, so positive goes under -ive; Only ize turns "recogn_" into a real word, so recognize goes under -ize.

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

What's on a 4th grade sheet

4th grade sheets draw from 19 words, 14 to a page. All 19 are on 5th grade sheets too, along with 3 more.

Some of the words:

creativenegativeattractiveprotectivemassivefestivenativeorganizeenergizesummarize

Complete and sort. Fill in the missing letters to make a real word, then write the whole word in its column. 14 words per page.

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

How to teach this

After sorting, play the job game: put each word in a two-word phrase. -ive words fit 'a ___ thing' (a creative thing); -ize words fit 'to ___' (to apologize). The frames prove the jobs.

Watch for: These suffixes have different JOBS, not just different letters: -ive words describe (an active dog), -ize words act (to apologize). Sorting by job is the deeper sort hiding inside the spelling sort. The buried base word is the meaning key: expensive hides expense, memorize hides memory. Excavating the base turns each word from vocabulary into sense.

Common questions about 4th grade suffixes -ive and -ize

What is the difference between -ive and -ize?: Job, not just spelling: -ive makes describing words (active, expensive), -ize makes doing words (realize, memorize). The sort teaches both the letters and the roles.
Why learn them as a pair?: Contrast teaches faster than isolation: seeing the two jobs side by side makes suffix-as-word-builder visible, which is the real lesson under the spelling.

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Aligned to Common Core L.4.4.b. Reviewed by the One more sheet team. Content version 241, updated August 2026.

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