Words ending in -ce are often spelled differently in Britain and the USA. For more information and guidance see Unit 36.
Different rules also apply to words that contain cian, cial and cious but these are dealt with in:
Unit 28 (cian)
Unit 30 (cial and cious)
The Spellzone interactive course is intended to be used online and may not be printed.
"Fantastic - the most relevant material/resource ever seen for both dyslexia and teaching spelling rules."
College Lecturer