"Written cardinals from 21 to 99 are hyphenated -
thirty-seven
fifty-six
eighty-three" from
here I don't remember being taught that at school, but maybe I've forgotten. Has the rule changed recently? Not so recently?
How do you write the 21-99 cardinals in your everyday life? Do you bother with a hyphen? For example on some bank forms? I can't think of any other context when one would write the numbers in letters.