Teaching k/ck spelling rule can be fun When teaching k/ck spelling rule use these activities to make it fun and easy! The spelling rule for the final /k/ sound is as follows: When the /k/ sound is at the end of a word it can be spelled with either the letter “k”  or the letters “ck”. When the final /k/ sound is preceded by a vowel team or a diphthong (e.g. ou) it is spelled with a “k”. For example, the words “break”, “beak”, “seek” and “soak” all have a long vowel sound before the final /k/ sound and therefore is /k/ is spelled “k”. When the final /k/ sound is preceded by a short vowel, the sound is spelled