FIGURES
As there are few fixed conventional uses for figures, we shall give simply our preferences.
In ordinary reading matter, spell out all round numbers, and numbers of one or two digits, unless of a technical character. When several numbers occur close together, and are to be compared, they may be expressed in figures:
120. Admission, one dollar.
120-1. Admission, fifty cents.
120-2. Admission: Men, $2; women, $1.50; children, 50 cents.
In No. 120-2 we use “50,” instead of “fifty,” because figures are used to express other numbers in the sentence.
TIME OF DAY
The time of day is generally spelled out in ordinary reading matter:
121. We shall start at four o’clock this afternoon.
But with A. M. and P. M. (these abbreviations are best set in small capitals) figures are always used:
121-1. We shall start at 4 P. M.