6th grade absorbed prefixes (im-, il-, ir-) worksheets
Sixth graders read and spell absorbed-prefix words confidently, explain the double letters at the seam, and extend the idea to other absorbing prefixes they meet (ad-, com-).
Free printable PDF worksheet, aligned to Common Core L.6.4.b.
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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.
relevantlegalbalancematureliteratereplaceablereversiblepatientlustrate
Columns: im- and il- and ir-. Only im turns "_mature" into a real word, so immature goes under im-; Only il turns "_literate" into a real word, so illiterate goes under il-; Only ir turns "_reversible" into a real word, so irreversible goes under ir-.
Every print pulls a fresh set of word lists at this level, so a make-up test or a second sibling never gets the same sheet.
What's on each sheet
- Complete and sort. Fill in the missing letters to make a real word, then write the whole word in its column. 21 words per page.
Every version prints on US Letter or A4, with its answer key on the last page.
How to teach this
Ask WHY the prefix changes: have your child try saying 'inpossible' and 'inlegal' quickly. The mouth smooths them automatically, which is exactly what happened to the language. Rules the mouth explains are never forgotten.
Watch for: All three prefixes are the same prefix, in-, wearing camouflage. Only the spelling changes to match the next letter; the meaning rides along untouched. The absorption explains the double letters kids find mysterious: illegal has two l's because in+legal fused. Seeing the seam makes the spelling logical instead of random.
Common questions about absorbed prefixes (im-, il-, ir-)
- Do other prefixes absorb too?
- Yes: ad- becomes ac-, af-, ap- (accept, affect, appear), and com- becomes col-, cor-. The in- family taught here is the clearest doorway into the whole phenomenon.
- How does this help with meaning?
- Most words on the page mean not-something. A reader who spots absorbed in- instantly negates the base: irresponsible, not responsible. It is speed-reading for meaning.
Related worksheets
- 5th grade absorbed prefixes (im-, il-, ir-) A step easier, same skill
- 6th grade adages and proverbs Same grade, nearby skill
- 6th grade analogies Same grade, nearby skill
- 6th grade connotation and denotation Same grade, nearby skill
- Absorbed prefixes (im-, il-, ir-), all grades The full progression
- All 6th grade English worksheets Every skill at this level
- All 6th grade worksheets Everything at this level
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Aligned to Common Core L.6.4.b. Reviewed by the One more sheet team. Content version 179, updated August 2026.
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