Focused phonics guideSpelling rules
When should a child use ck instead of k at the end of a word?
Quick answer
In many one-syllable words, ck is used for /k/ immediately after a single short vowel, as in back, neck, sick, rock and duck. It is a useful spelling generalisation, not an exception-free law.
Pattern to notice
CK spelling rule
ckk
How to teach this pattern
- Anchor the rule to one-syllable words with a single short vowel immediately before /k/.
- Contrast ck endings with familiar k endings so the child notices context rather than memorising a list.
Common confusions to watch for
- Using ck after every vowel regardless of whether the vowel is short.
- Treating the pattern as universal instead of a useful spelling generalisation.
Simple practice ideas
- Sort decodable words by k versus ck ending.
- Dictate short-vowel words and justify the final spelling choice.
Learning sequence
Helpful first
What can come next
Explore related phonics patterns
More from spelling rules
These links are selected from the published Tiny Steps phonics graph, prioritising nearby patterns in the same family before adjacent curriculum concepts.
Floss rule: ff, ll, ss and zzIn many one-syllable words with one short vowel, final f, l, s or z is doubled, as in puff, hill, miss and buzz. The Floss rule is a useful generalisation with exceptions.CH vs TCH spellingTCH commonly spells the /ch/ sound immediately after a single short vowel in a one-syllable word, as in match. CH also spells that sound, and familiar exceptions such as much and rich need explicit practice.QU sound patternIn many common English words, q is followed by u and the pair commonly represents /kw/, as in queen, quit and quiz. Less common exceptions can be added after the frequent pattern is secure.CH digraphIn early phonics, ch is commonly taught as one grapheme representing /ch/ in words such as chat, chip and much. Less common pronunciations can be introduced later.
Related Tiny Steps resources
Keep the pattern inside the bigger reading pathway
Need help finding the actual gap?
Use an assessment when practice alone is not showing what is stuck.
The focused guide explains one pattern. A broader assessment can separate sound knowledge, blending, decoding, spelling and fluency needs.