English: hyphens in numbers
Self-tutoring about English: the tutor mentions hyphenating numbers.
Indeed, numbers like 74 should be hyphenated, if written: seventy-four. I’ve never known so.
Source:
Hodges, Horner et al. Harbrace Handbook for Canadians. Scarborough: Nelson, 2003.
Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.