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Michigan Tech


General Rules

Spell out numbers through ninety-nine and round numbers (hundreds, thousands, hundred thousands) in text, but use numerals when a series of numbers are used.

The school graduated 101 girls and 96 boys.

Spell out a figure when beginning a sentence even though numerals are used elsewhere in the text.

Numbers of more than three figures are pointed off with commas.

1,259 women; $4,700,900.

1220 SAT (no comma)

Numbers below 100 are hyphenated when they consist of two words.

thirty-four; ninety-eight

"Hungarian Rhapsody No. 2" (abbreviate number)


Spell out dates and include the day of the week and year for informational purposes.

Wednesday, January 23, 2008 not January 23rd, 2008 or 1/23/08.

’92 ’09
or MS ’92 PhD ’09
or BS English Literature ’78 MS Rhetoric and Technical Communication ’92
no punctuation

9:00 p.m., Saturday, April 28, 2012
but Saturday, 9:00 p.m. Rozsa Center

Sunday, April 28, 2012


Spell out the age of person or an object.

Twenty-one-year-old sweater; Sarah was ten.

Credit Hours

Use numerals to refer to credit hours.


Use the word percent instead of the symbol %. A numeral is used before the word percent, unless it comes at the beginning of the sentence.

Percent—refers to an exact number.

Thirty percent of their wages went to taxes. The power play is running at 25 percent.

Percentage—used when there is no exact number.

The percentage of their salaries that went to taxes was significant.

Room Numbers

Put the building name first before room numbers

Administration Building, Room G20;
Fisher Hall, Room 135;
Fisher Hall 135

Telephone Numbers

Use hyphens in telephone numbers

1-888-688-1885; 1-906-487-2319