Use a hyphen in compound numbers between twenty-one and ninety-nineand when used in larger numbers like two hundred fifty-five. (Note that you do not use an and between any of the numbers as that would indicate a decimal point.) Ordinal numbers such as thirty-first, seventy-second need hyphens also.
Instructions: Supply hyphens where they are needed in these sentences.
1. It used to be that one had to be twenty one to vote.
2. When adding thirty four and forty two, you get seventy six.
3. One hundred thirty seven people were killed in that crash.
4. The sixty fourth running of that race was cancelled due to weather.
5. Many more privileges come to people who are sixty five or older.
–For answers scroll down.

Answers:
1. It used to be that one had to be twenty-one to vote.
2. When adding thirty-four and forty-two, you get seventy-six.
3. One hundred thirty-seven people were killed in that crash.
4. The sixty-fourth running of that race was cancelled due to weather.
5. Many more privileges come to people who are sixty-five or older.

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from Daily Grammar Lessons Blog
http://dailygrammarlessons.blogspot.com/2016/04/lesson-416-mechanics-punctuation-hyphens.html

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