Introduction. One of the greatest challenges for a history teacher in today s do-it-now, new is always better world is in conving students that studying the. Exame: 1956 was quite a year. Rule 2a. Hyphenate all pound numbers from twenty-one through ninety-nine. Exames: Forty-three peoe were injured in the train wreck. Twenty-seven of them were hospitalized. Rule 2b.