Numbers and Numerical References
When referring to a graduate of the university, include that last two digits of the class year (preceded by an apostrophe) following the person's name.
For example: Susan S. Smith '94
As a general rule, numbers from one to nine should be written out; numbers 10 and over should be left in numerical form. Use figures, however, when referring to sections of a book, grade point averages, age, percentages and scores.
For example: See page 6. A g.p.a. of 3. A total of 5 percent. An ACT score of 9.
He is 4 years old.
When referring to percentages, do not use “%” except in tables and technical text.
For example: More than 20 percent passed the test with a score of 85 or better.
Spell out ordinal numbers first through ninth. Numbers above the 10th ordinal may use figures.
For example: First, second, 10th, 23rd, 31st.
In a telephone number, use a dash to separate its components (e.g. to separate the area code from the prefix.)
For example: 657-278-8489
When referring to a specific time, drop the minutes if that time is on the hour. Use noon and midnight, not 12 p.m. or 12 a.m.
For example: 8:15 p.m.; 10-11 a.m.; The event begins at noon.