The letters 'ck' are generally used to spell the 'k' sound in the middle or at the end of words if there is a short vowel sound just before the 'k' sound.
However, there are always exceptions to rules!?
If the 'k' sound is followed by a 't' then the letter 'c' is used instead.
If the 'k' sound comes after the short 'i' vowel sound then 'ck' is used for one-syllable words but 'c' is usually used for words with more than one syllable.
In this activity, you can practise choosing the correct spelling for words containing the 'k' sound.