The ck or k rule at the end of a word

When does the rule apply?

This rule answers a question students ask constantly: why does "duck" need a c when "dusk" does not? The letter just before the /k/ decides it. One short vowel right before /k/ calls for ck. Anything else, a consonant, a vowel team or a silent e pattern, takes plain k. Longer words are different again: words of two or more syllables that end in /ik/ almost always spell it ic, as in magic and picnic. That ending gets its own table because it is a common misspelling in words students can otherwise read.

Words that follow the rule

Words that break the rule

How do you teach it?

Start once students read short vowel words with digraphs. Show ck as a two-letter team that guards the short vowel. Then contrast pairs where only the letter before /k/ changes: "luck" and "lurk", "pick" and "pink", "sock" and "soak". Have students point to the letter before /k/ and name it as a vowel or a consonant before they spell.

"Say 'stick'. What sound comes before /k/? /i/, a short vowel, all by itself. So we use ck. Now 'stink'. What comes before /k/? /ng/, spelled with n. That's a consonant, so plain k is enough. We only need ck right after one short vowel."

What is the common error, and the fix?

Two errors dominate. Younger students write "bak" and "duk", leaving out the c. Older students overuse ck and write "milck" or "magick". Both come from guessing instead of checking. The fix is one question asked out loud: what comes right before the /k/? A lone short vowel means ck. Anything else means k, and a longer word ending in /ik/ takes ic.

Sort it: a hands-on activity

Give students 24 word cards from the lists below and three headers: "ck", "k" and "ke". After sorting, they underline the letter before the /k/ on every card. The underlined letters in the ck column should all be single short vowels. If one is not, that card is in the wrong column.

How this list was built