In dividing at the end of a line:
Do not run over a syllable of two letters.
Do not divide N. Y., M. P., LL. D., M. D., a. m., p. m., etc.
Do not divide figures thus: 1,-000,000; but thus 1,000,-000.
Do not divide a word of five letters or less.
10. Figures:
Use figures for numbers of a hundred or over, except when merely a large or indefinite number is intended: twenty-three, 123, about a thousand, a dollar, a million, millions, a thousand to one, from four to five hundred.
Use figures for numbers of less than 100 when they are used in connection with larger numbers: There were 33 boys and 156 girls; there were 106 last week and 16 this week.
Use figures for hours of the day: at 7 p. m.; at 8:30 this morning.
Use figures for days of the month: April 30, the 22nd of May.
Use figures for ages: he was 12 years old; little 2-year-old John. If the words "2-year-old John" begin a sentence or headline, spell out the age.
Use figures for dimensions, prices, degrees of temperature, per cents., dates, votes, times in races, scores in baseball, etc.: 3 feet long, $3 a yard, 76 degrees, Jan. 14, 1906. Time of race—2:27.
Use figures for all sums of money: $24, $5.06, 75 cents.
Use figures for street numbers: 1324 Grand avenue.