SACAWAC is a very useful approach to learning spellings. The child first has an opportunity to study the unknown word. Then they cover the word and attempt to write it. After checking against the original, the child may need to attempt it again.
Having the opportunity to write spellings allows the child to use kinaesthetic memory to recall spellings - they develop a kind of 'muscle memory' for common letter strings.
You can read more about SACAWAC here.
Note: SACAWAC can be used for both Irish and English spellings