If you've really gotten into spelling competition, you most likely have run into the problem of spelling the ending of a word that sounds like "uhnt". There are pretty much two things that could be; -ant or -ent. This one is fairly simple.
RULE: After a soft c (as in cent) or a soft g (as in George) spell it a-n-t/a-n-c-e
After a hard c (as in cat) or a hard g (as in girl) spell it e-n-t/e-n-c-e