Both terms are acceptable for those in the U.S. (AP) Follow the person's preference.
In general, don’t use a hyphen if the word is easily understood. Use a hyphen in awkward combinations. See also hyphens.
Spell out one through nine; use numerals for 10 and above.
Use numerals when referring to ages; dollars; credit hours; page, volume or chapter numbers; percentages; dates; addresses; dimensions or measurements; or telephone numbers:
- four 3-credit-hour classes
- page 4
- 5 percent
- 0.66 percent
- 8-month-old boy
- 32-year-old graduate student
- the graduate student is 32 years old
When discussing a range of years, separate this range with an en dash:
the 2006–2007 academic year
Spell out and hyphenate fractions:
For round figures greater than 999,999, use million or billion after the initial numeral(s); for more precise numbers, use all numerals:
2 million; $2.8 billion; 234,500,000
Use commas in numbers greater than or equal to 1,000:
2,000; 23,456; the 227,000-square-foot BSE Building
EXCEPT SAT scores:
a combined score of 1250
Spell out all numbers that occur at the start of a sentence or reword the sentence:
Six credit hours were all he needed to complete the major. He needed just 6 credit hours to complete the major.
EXCEPTION: In a list, it’s OK to start a sentence or phrase with a numeral.
UTSA has expanded its degree programs to include
- 62 bachelor’s degrees
- 49 master’s degrees
- 22 doctoral degrees
It’s also acceptable to use numerals in the following examples:
table 1, act 2, scene 3
a 5-4 score